An unexpected inversion of enantioselectivity in the proline catalyzed intramolecular Baylis–Hillman reaction
摘要:
A highly enantioselective proline catalyzed intramolecular Baylis-Hillman reaction of hept-2-enedial is reported. Addition of imidazole to the mixture results in art unusual inversion of enantioselectivity. (c) 2005 Elsevier Ltd. All rights reserved.
Direct Transformation of Simple Enals to 3,4-Disubstituted Benzaldehydes under Mild Reaction Conditions via an Organocatalytic Regio- and Chemoselective Dimerization Cascade
作者:Xixi Song、Xinshuai Zhang、Shilei Zhang、Hao Li、Wei Wang
DOI:10.1002/chem.201201709
日期:2012.8.6
organocatalyzed, direct preparation of 3,4‐disubstituted benzaldehydes from simpleenalsundermildconditions without the need for an additional oxidant has been developed. Notably, self‐dimerization of an enal precursor and cross‐dimerization of two distinct enals have been realized with high regio‐ and chemoselectivity to give structurally diverse 3,4‐substituted benzaldehydes in good yields (76–99 %)