Asymmetric One-Pot Synthesis of 1,4-Dihydroquinolines via an Organocatalytic Aza-Michael/Michael Cascade Strategy
作者:Yona Lee、Seungpyeong Heo、Sung-Gon Kim
DOI:10.1002/adsc.201401176
日期:2015.5.4
A synthetic method for the construction of fully substituted enantioenriched 1,4‐dihydroquinolines using an organocatalytic aza‐Michael/Michael cascadereaction has been developed. The asymmetricreaction of 2‐(tosylamino)phenyl α,β‐unsaturated ketones with alkynyl aldehydes, promoted by diphenylprolinol O‐TMS ether as an organocatalyst, generated chiral 1,4‐dihydroquinolines in good to high yields
Synthesis of methylene cyclopropane-fused chromenes and dihydroquinolines by sequential [4 + 2]- and [1 + 2]-annulation
作者:Tianyu Lu、Xuange Zhang、Zhiwei Miao
DOI:10.1039/d0ob00389a
日期:——
A base promoted sequential [4 + 2]- and [1 + 2]-annulation of 2-hydroxychalcones or 2-tosylaminochalcones with prop-2-ynylsulfonium salts has been developed to give the corresponding methylene cyclopropane fused dihydroquinolines or chromenes in moderate to good yields. This transformation has advantage of wide substrate scope and functional group tolerance as well as excellent regioselectivity. Prop-2-ynylsulfonium