Catalytic Asymmetric Synthesis of Allylic Thiol Derivatives
作者:Larry E. Overman、Scott W. Roberts、Helen F. Sneddon
DOI:10.1021/ol8002942
日期:2008.4.1
The palladium(II) complex [(Rp,S)-COP-Cl]2 and its enantiomer catalyze the rearrangement of linear prochiral O-allyl carbamothioates under mild conditions to provide branched S-allyl carbamothioates in high yield and high enantiomeric purity.
钯 (II) 络合物 [(Rp,S)-COP-Cl]2 及其对映异构体在温和条件下催化线性前手性 O-烯丙基硫代氨基甲酸酯的重排,以高产率和高对映体纯度提供支链 S-烯丙基硫代氨基甲酸酯。
Gold-Catalyzed Asymmetric Thioallylation of Propiolates via Charge-Induced Thio-Claisen Rearrangement
作者:Hanbyul Kim、Jiwon Jang、Seunghoon Shin
DOI:10.1021/jacs.0c09783
日期:2020.12.9
A gold(I)-catalyzedenantioselective thioallylation of propiolates with allyl sulfides is described. The key mechanistic element is a sulfonium-induced Claisenrearrangement which helps minimize the allyl dissociation and render higher enantioselectivity. This protocol features remarkable scope of the allyl moiety, allowing enantiocontrolled synthesis of all-carbon quaternary centers, and exhibits
Highly Enantioselective Simmons–Smith Fluorocyclopropanation of Allylic Alcohols via the Halogen Scrambling Strategy of Zinc Carbenoids
作者:Louis-Philippe B. Beaulieu、Jakob F. Schneider、André B. Charette
DOI:10.1021/ja402393w
日期:2013.5.29
Highly enantio- and diastereoenriched monofluorocyclopropanes were accessed via the Simmons-Smith fluorocyclopropanation of allylicalcoholsusing difluoroiodomethane and ethylzinc iodide as the substitutedcarbenoid precursors. The scrambling of halogens at the zinccarbenoid led to the formation of the fluorocyclopropanating agent (fluoroiodomethyl)zinc(II) fluoride. This strategy circumvented the
Enantioselective Synthesis of 1,2,3-Trisubstituted Cyclopropanes Using <i>gem</i>-Dizinc Reagents
作者:Lucie E. Zimmer、André B. Charette
DOI:10.1021/ja906033g
日期:2009.11.4
The first asymmetric cyclopropanation of allylicalcoholsusing gem-dizinc carbenoids, which allows the synthesis of 1,2,3-substituted cyclopropane derivatives in high yields and excellent enantio- and diastereoselectivities, is reported. The initially formed cyclopropylzinc undergoes an in situ B/Zn exchange with the stoichiometric chiral ligand to generate a cyclopropyl borinate that can be directly