Synthesis of α,β-Unsaturated Aldehydes Based on a One-Pot Phase-Switch Dehydrogenative Cross-Coupling of Primary Alcohols
作者:Manuel G. Mura、Lidia De Luca、Maurizio Taddei、Jonathan M. J. Williams、Andrea Porcheddu
DOI:10.1021/ol500916g
日期:2014.5.16
hydrogen-transfer strategy for a direct access to α,β-unsaturated aldehydes has been developed. The employment of enolates prepared in situ from alcohols avoided handling unstable aldehydes and provided a very appealing route to different cinnamaldehydes substituted in position 2. A silica-grafted amine was used as phase-switch tag leading to a selective one-pot process in favor of cross-dehydrogenative coupling
Microwave-assisted organocatalytic cross-aldol condensation of aldehydes
作者:Dimitris Limnios、Christoforos G. Kokotos
DOI:10.1039/c3ra00114h
日期:——
An environmentally benign organocatalytic cross-aldol condensation of aldehydes under microwave irradiation in the absence of solvent is described. Using pyrrolidine as a catalyst, an efficient and sustainable atom economic method was developed for the cross-aldol condensation of various aldehydes with excellent results. Among the products, jasmine aldehyde, α-hexyl cinnamaldehyde and cyclamen aldehyde, three compounds of great industrial demand, were synthesised.