Asymmetric synthesis of either diastereomer of trifluoromethylated allylic amines by the selective reduction of trifluoromethyl α,β-unsaturated N-tert-butanesulfinyl ketoimines
A novel N,N-dibenzyl diaminomethylenemalononitrile organocatalyst efficiently promotes asymmetric Henry reactions of trifluoromethyl enones with nitromethane, affording the corresponding highly functionalized products in high yields with excellent enantioselectivities (up to 90% ee).
A squaramide organocatalyst efficiently promoted the asymmetric Friedel–Crafts alkylation of α,β-unsaturated trifluoromethyl ketones with aromatic alcohols in a one-pot procedure, affording corresponding 6-trifluoromethyl-substituted 7,8-dihydrochromen-6-ol derivatives (up to 94% yield, 74% ee).
Organocatalytic Asymmetric Benzylation and Aldol-Hemiacetalization of α,β-Unsaturated Trifluoromethyl Ketones: Efficient Enantioselective Construction of 3,4-Dihydroisocoumarins
作者:Jindian Duan、Yuyu Cheng、Jing Cheng、Rou Li、Pengfei Li
DOI:10.1002/chem.201604920
日期:2017.1.12
developed for the organocatalytic enantioselective benzylation and aldol‐hemiacetalization of α,β‐unsaturated trifluoromethyl ketones with toluene derivatives in the presence of a tertiary amine‐thiourea catalyst. This method represents a facile and efficient strategy for the asymmetric synthesis of opticallyactive 3,4‐dihydroisocoumarins bearing a trifluoromethylated tetrasubstituted carbon stereocenter
Isothiourea-Mediated One-Pot Synthesis of Trifluoromethyl Substituted 2-Pyrones
作者:Pei-Pei Yeh、David S. B. Daniels、David B. Cordes、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1021/ol403697h
日期:2014.2.7
A one-potisothiourea-mediated Michael addition/lactonization/thiol elimination cascade sequence for the formation of 4,6-disubstituted and 3,4,6-trisubstituted 2-pyrones from (phenylthio)acetic acids and α,β-unsaturated trifluoromethyl ketones is described. The synthesis of a COX-2 inhibitor and the wide-ranging derivatization of the 2-pyrone moiety to trifluoromethyl substituted aromatics and heteroaromatics
Highly Enantioselective Michael Addition of Cyclic 1,3-Dicarbonyl Compounds to β,γ-Unsaturated α-Keto Esters
作者:Xing-Kuan Chen、Chang-Wu Zheng、Sheng-Li Zhao、Zhuo Chai、Ying-Quan Yang、Gang Zhao、Wei-Guo Cao
DOI:10.1002/adsc.201000045
日期:——
A highlyenantioselectiveMichaeladdition of cyclic 1,3‐dicarbonyl compounds to β,γ‐unsaturated α‐keto esters catalyzed by amino acid‐derived thiourea‐tertiary‐amine catalysts is presented. Using 5 mol% of a novel tyrosine‐derived thiourea catalyst, a series of chiral coumarin derivatives were obtained in excellent yields (up to 99%) and with up to 96% ee under very mild conditions within a short