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1 s displaying native reactivity or reactivity umpolung.
2 olved in a (4 + 2) cycloaddition after redox umpolung.
3 ased nucleophile, hence realizing reactivity umpolung.
4 valent, generated in situ from NHC-catalyzed umpolung.
5  azole enabled by photoredox-catalyzed arene umpolung.
6 e pivotal intermediates in carbene-catalyzed umpolung.
7  and support the hypothesis of a pH-mediated umpolung.
8                                           An umpolung 1,4-addition of aryl iodides to enals promoted
9 , metal-based oxidation to Cr(VI) results in umpolung, a switch from nucleophilic to electrophilic re
10 developed using a phosphine-catalyzed tandem umpolung addition and intramolecular cyclization of amid
11  chiral N-heterocyclic carbene catalyzes the umpolung addition of aldehydes to racemic alpha-keto est
12 eocyclic carbene catalyzes the a(3) --> d(3)-umpolung addition of alpha,beta-enals to racemic alpha-k
13 ntermediate provides evidence for an unusual umpolung addition of glyoxylates to nitrosobenzenes with
14 ditive is the key to realizing the efficient umpolung addition of nucleophilic aminyl radicals to ele
15                  The coupling occurs through umpolung addition of organometallic reagents to the nitr
16                                    The first umpolung addition/intramolecular Wittig reaction, cataly
17 riazolyl N-heterocyclic carbene catalysts in umpolung aldehyde chemistry requires a straightforward r
18 he mechanism of the former is a tandem gamma-umpolung/aldol/Wittig/dehydration process, as establishe
19 epicocconigrone A has been achieved using an umpolung alkylation-lactonization to assemble an isochro
20 a hindered, quaternary stereocenter using an umpolung allylation are also highlights from a strategy
21 dative Rautenstrauch cycloisomerization, and umpolung alpha-substitution of a p-toluenesulfonylhydraz
22 c peroxides, with carbon nucleophiles are an umpolung alternative to the common approaches to C-O bon
23                                              Umpolung amide synthesis (UmAS) emerged from alpha-halo
24 in where half of the amides are formed using umpolung amide synthesis (UmAS) to replace conventional
25 nitromethane to aldehydes and finishing with Umpolung Amide Synthesis (UmAS).
26  amides in peptides by simply performing the umpolung amide synthesis reaction under an atmosphere of
27                             The mechanism of umpolung amide synthesis was probed by interrogating pot
28 nues for addressing challenges in pericyclic Umpolung and regioselectivity control.
29 ering a didactic overview of organocatalytic umpolung and should serve as an inspiration for further
30 ssistance of C-C bond formation (i.e., "LUMO umpolung") and crossover from a diradical to a zwitterio
31 f bisoxindole alkaloid scaffolds via in situ Umpolung, and cross-electrophilic coupling methodology.
32                              The cooperative umpolung annulation eliminates mutual deactivation and l
33                                         This umpolung approach allows for the construction of optical
34                                         This umpolung approach compared to the classic Larock indole
35                                         This Umpolung approach does not rely on stoichiometric oxidan
36          Herein, we report an organometallic umpolung approach for iron-mediated C-H propargylic ethe
37        We report an electrochemical carbonyl umpolung approach for the deoxygenative cyanofunctionali
38                              The scope of an umpolung approach to expand synthetic access to bifuncti
39 s via in situ-derived azoalkenes provides an umpolung approach to ketone alpha-alkylation that has co
40                          The utility of this umpolung approach to pyridyl ethers, which is complement
41                                   A two-step umpolung approach to the diastereoselective synthesis of
42                 In this study, we outline an umpolung approach, which is triggered by oxidative initi
43 ex molecules primarily by polarity reversal (umpolung) approaches.
44                                              Umpolung-based organocatalysis has made a remarkable bre
45 ron acceptor properties; demonstrating redox-umpolung behavior.
46  utility, under mild conditions; indeed, the umpolung borylation of a tertiary alkyl bromide can be a
47              These methods provide the first umpolung C-H functionalization of azapentadienyl palladi
48  normal reaction patterns, commonly known as Umpolung, can be divided into (1) functional group Umpol
49 pper has never showed catalytic activity for umpolung carbanions in hydrazone chemistry.
50 l-directed, nickel-catalyzed three-component umpolung carboamination of unactivated alkenes with aryl
51                      Taking advantage of the umpolung carbonyl-olefin coupling reactivity enabled by
52 effective nickel-catalyzed cross-coupling of Umpolung carbonyls and alkyl halides was developed.
53 lkylation techniques, this reaction utilizes Umpolung carbonyls as the environmentally benign alkyl n
54 ategy for visible-light photoredox-catalyzed umpolung carboxylation of diverse carbonyl compounds wit
55 hich have never been successfully applied in umpolung carboxylations with CO(2) (to the best of our k
56                          Among a plethora of umpolung catalysts, bis(amino)cyclopropenylidenes (BACs)
57      N-Heterocyclic carbenes (NHCs) catalyze Umpolung condensation reactions of carbonyl compounds, i
58  carbene capable of promoting intermolecular Umpolung condensation through proton transfer and procee
59                          Here, we present an umpolung cyanation strategy for the synthesis of N-cyano
60 )-mediated reduction of amides and reductive umpolung cyclizations via aminoketyl radicals as a key s
61 s of the two reactants are reversed (German, umpolung) during carbon-nitrogen bond formation relative
62 action engages a novel mechanism that merges umpolung electrophilic amination via copper(I)-catalyzed
63                              This reactivity umpolung enables the formal alpha-allylation of (pseudo)
64 cess in which the silanone initially acts in umpolung fashion as a base (rather than an acid), due to
65                     Organolithiums add in an umpolung fashion to the beta-carbon of N-carbamoyl enami
66  allyl, alkynyl, and heteroaryl groups in an umpolung fashion.
67  show that this central linkage undergoes an umpolung from Te-->Pt in [1](+) to Te<--Pt in 2.
68 activity of a ligand is completely reversed (umpolung) from Lewis basic/nucleophilic to acidic/electr
69                                          The umpolung functionalization of imines bears vast syntheti
70        Here, we report the application of an umpolung glycosylation strategy to the synthesis of O-gl
71          Although catalytic functional group Umpolung has been extensively investigated, the highly o
72 eophilic (or vice versa), and (2) pericyclic Umpolung, in which the regioselectivity of pericyclic re
73  proceeds through NHC-catalyzed tandem imine umpolung-intramolecular aza-Michael addition followed by
74                         Leveraging a unique "Umpolung"-mediated beta-protonation, this process has ev
75              Despite a manifold of different umpolung methods available today, overcoming the inheren
76                                              Umpolung N-heterocyclic carbene (NHC) catalysis of non-a
77 ypically employed in the generation of these Umpolung nucleophiles.
78 eslow intermediates are viable for catalytic umpolung of areniums.
79 al intermediates, atroposelective synthesis, umpolung of electrophiles other than aldehydes, and the
80 clic guanidines through iodine(III)-mediated umpolung of halide salts is described.
81                                              Umpolung of imine with nitrogen acting as an electrophil
82 ted acid-catalyzed, electrophilic amination (Umpolung of imine) as a method for an inverse Aza Intram
83                       Although NHC-catalyzed umpolung of imines are known, the related reactions unde
84 ere we show an effective strategy to realize umpolung of imines promoted by organocatalytic aromatiza
85 gle-step cross-linking strategy based on the umpolung of native cysteinyl thiols to electrophilic epi
86 for the rational design of catalysts for the umpolung of nucleophiles.
87 , we present a hypervalent F-iodane mediated umpolung of pyridyl ketones triggered by Lewis base/Lewi
88 ring into an electrophile, thereby providing umpolung of reactivity (Inorg.
89 ity reversal, rotation, and stereoelectronic Umpolung of the amino group.
90 e beta-C-H halogenation of cyclic enones via umpolung of the beta-carbon.
91 a chiral confined acid-catalyzed, asymmetric Umpolung of the Diels-Alder reaction.
92            The strategy relies on an in situ Umpolung of the F(n)ArH, followed by selective Au((I))/A
93 ansfer upon photoexcitation, but results in "umpolung" or a reversal of the predicted charge-separati
94  As a proof of concept, utilizing this redox-umpolung photochemistry of PLY, we demonstrate a direct
95                                              Umpolung (polarity reversal) strategies of aldehydes and
96 ation of alpha-oxygenated carbanions via the umpolung process.
97                                         This umpolung reaction allows for an unconventional preparati
98 -disubstituted indolin-3-ones via the double umpolung reaction of 2-aminophenyl-3-oxopropanoate.
99 ective and enantioselective C-C bond-forming umpolung reaction of imines and enones under the catalys
100                Enabled by this unprecedented umpolung reaction of imines, conceptually new and concis
101 culations suggest an ionic mechanism for the umpolung reaction of imines.
102  the enantioselective and diastereoselective umpolung reaction of trifluoromethyl imines with acrylat
103                      We demonstrate that the umpolung reaction proceeds within minutes in various cel
104 the gas phase acidity and selectivity in two Umpolung reactions catalyzed by these species; such corr
105                The development of asymmetric umpolung reactions of imines (in which the imines act as
106 that promote the highly efficient asymmetric umpolung reactions of imines with the carbon electrophil
107                                        These umpolung reactions provide a conceptually new and practi
108  cycloisomerizations, formal cycloadditions, umpolung reactions, rearrangements and ring-opening lact
109 thdrawing groups to imines could enhance the umpolung reactivity by both electronegativity and aromat
110                 This strategy highlights the umpolung reactivity of 2-aminobenzaldehyde arylhydrazone
111 e-boranes has been developed on the basis of umpolung reactivity of in situ generated alkylarylphosph
112 otonation by n-butyllithium, participated in umpolung reactivity via 1,2-addition to tert-butyl 4-oxo
113 rmation of the diazomethyl radicals provides umpolung reactivity, thus opening new opportunities for
114  are inherently nucleophilic, which exhibits umpolung reactivity.
115 otocol explores thiamine hydrochloride as an umpolung reagent and delivers 23 biologically relevant c
116 l method for trifluoroacetylation through an umpolung reagent, thereby transforming an electrophilic
117                                         This umpolung signals an increase in the electron releasing a
118                       We find that the first Umpolung step, the addition of the NHC catalyst to a car
119 ionship of the functional groups requires an Umpolung strategy as one of the alpha-carbonyl positions
120                     A pH-controlled polarity umpolung strategy can be used to synthesize different fl
121                                          The umpolung strategy encompasses all the methods that make
122                          Herein we report an umpolung strategy for the bioconjugation of selenocystei
123 ion of the alkyl group, in contrast with the umpolung strategy for this bond construction (cross-coup
124 iphosphate formation be carried out using an umpolung strategy in which pyrophosphate was activated t
125                          Photoredox-mediated umpolung strategy provides an alternative pattern for fu
126  covalent ligand discovery, we elaborated an umpolung strategy that exploits the 'polarity reversal'
127                      Here we describe how an umpolung strategy that involves the addition of Grignard
128                         Herein, we report an umpolung strategy that reverses the innate polarity of b
129                        Herein we disclose an umpolung strategy to achieve radical carbonyl arylation
130                                           An umpolung strategy was used for the preparation of highly
131           The current strategy represents an umpolung strategy when compared to the literature approa
132                              By emulating an umpolung strategy-guided design, we report for the first
133                              The use of this umpolung synthon has enabled, in enantiomerically enrich
134 ide (MAC) reagents are shown to be effective umpolung synthons for enantioselective additions to N-Bo
135 ide (MAC) reagents are shown to be effective umpolung synthons for enantioselective Michael addition
136 ctrophilic through a mild and chemoselective umpolung transformation, a broad range of widely availab
137 es but also expands the scope of NHC-induced umpolung transformations.
138                                         This umpolung-type alkylation proceeds under mild conditions,
139       Aryl acetonitrile derivatives are thus umpolung-type synthons of the corresponding aryl carbony
140 se transformations employ typical as well as Umpolung types of bond disconnections and have served as
141  amide carbonyl functionality and subsequent umpolung via N-oxide addition generates an electrophilic
142 yl ipso-sites are activated as nucleophiles (umpolung), vinylogation extends the nucleophilic charact
143               Through polarity reversal, or "umpolung", we show here that typical nucleophiles, such
144 ng, can be divided into (1) functional group Umpolung, where electrophilic groups are rendered nucleo
145 se dimerization events represent an affinity umpolung, wherein the inversion in electronic affinity r

 
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