Catalytic asymmetric trifluoromethylthiolation via enantioselective [2,3]-sigmatropic rearrangement of sulfonium ylides
作者:Zhikun Zhang、Zhe Sheng、Weizhi Yu、Guojiao Wu、Rui Zhang、Wen-Dao Chu、Yan Zhang、Jianbo Wang
DOI:10.1038/nchem.2789
日期:2017.10
into a variety of molecules, there remain significant challenges regarding the enantioselective synthesis of SCF3-containing compounds. Here, an asymmetric trifluoromethylthiolation that proceeds through the enantioselective [2,3]-sigmatropicrearrangement of a sulfonium ylide generated from a metal carbene and sulfide (Doyle–Kirmse reaction) has been developed using chiral Rh(II) and Cu(I) catalysts
Enantioselective Gold(I)-Catalyzed Vinylogous [3 + 2] Cycloaddition between Vinyldiazoacetates and Enol Ethers
作者:John F. Briones、Huw M. L. Davies
DOI:10.1021/ja407179c
日期:2013.9.11
vinyldiazoacetates with enolethers catalyzed by the binuclear gold complex (R)-DTBMSegphos(AuCl)2 activated by silver hexafluoroantimonate results in a highly enantioselective [3 + 2] cycloaddition. The [3 + 2] cycloaddition proceeds with dynamic kinetic resolution when the enolether is a 4-substituted 1-(methoxymethylene)cyclohexane. The reaction is initiated by nucleophilic attack of the vinyl ethers at the vinylogous
Rhodium(I)-Catalyzed Direct Enantioselective C–H Functionalization of Indoles
作者:Dong-Xing Zhu、Ming-Hua Xu
DOI:10.1021/acs.joc.2c02624
日期:——
A highly regiospecific vinylogous carbene insertion protocol for direct asymmetric C–H functionalization of indoles with arylvinyldiazoacetates has been developed. Under the catalysis of simple Rh(I)/chiral diene complexes, the reaction occurs solely at the vinylogous position of the vinylcarbenoid with exceptional E selectivity and enantiocontrol. It provides an efficient way to obtain an interesting
Tunable Divergent Reactivity of Aziridinium Ylides in the Synthesis of Complex Piperidines and Azetidines
作者:Mahzad Dehghany、Giuliana Pavaneli、Jacob W. Kailing、Olivia M. Duke、Ilia A. Guzei、Caroline Da Ros Montes D’Oca、Israel Fernández、Jennifer M. Schomaker
DOI:10.1021/acscatal.3c06173
日期:2024.4.19
increase the fraction of sp3 carbon atoms (Fsp3) of drug-like scaffolds in a stereocontrolled manner, while enabling explorations of unusual amine chemical space, inspired our efforts to tune the reactivity of aziridinium ylides. A sequential nitrene–carbene transfer of simple allenes leads to divergent product outcomes depending on the nature of the carbene precursor, furnishing products of different
Controlling Factors for C−H Functionalization versus Cyclopropanation of Dihydronaphthalenes
作者:Etienne Nadeau、Dominic L. Ventura、Jonathan A. Brekan、Huw M. L. Davies
DOI:10.1021/jo902644f
日期:2010.3.19
Rhodium(II)-catalyzed reactions of vinyldiazoacetates with dihydronaphthalenes were systematically studied. These substrates underwent cyclopropanantion and/or the combined C-H activation/Cope rearrangement in good overall yield and with good diastereo- and enantiocontrol. The selectivity of these reactions was profoundly influenced by the nature of the chiral catalyst, the vinyldiazoacetate, and the dihydronaphthalene. The best combinations for achieving the highest selectivity in the cyclopropanation and the combined C-H activation/Cope rearrangement of 1,2-dihydronaphthalenes are methyl 2-diazopent-3-enoate (2a)/Rh-2(S-DOSP)(4) and methyl 3-(tert-butyldimethylsilyloxy)-2-diazopent-3-enoate (2b)/Rh-2(S-PTAD)(4). These combinations are very effective at enantiodivergent reactions of 1-methyl-1,2-dihydronaphthalenes.