Diastereoselective nitrocyclopropanation of 2,5-dihydrothiophene-3-carbaldehydes
摘要:
An unprecedented domino Michael/alpha-alkylation reaction between 2,5-dihydrothiophene-3-carbaldehydes and bromonitromethane is presented. This process, efficiently catalyzed by DL-proline in the presence of MeOH/NaOAc system, provides access to novel 6-nitro-3-thiabicyclo[3.1.0]hexane-1-carbaldehyde derivatives in good yields with good to excellent diastereoselectivities. (C) 2012 Elsevier Ltd. All rights reserved.
One-Pot, Four-Step Organocatalytic Asymmetric Synthesis of Functionalized Nitrocyclopropanes
作者:Anna Zaghi、Tatiana Bernardi、Valerio Bertolasi、Olga Bortolini、Alessandro Massi、Carmela De Risi
DOI:10.1021/acs.joc.5b01607
日期:2015.9.18
The asymmetric synthesis of functionalized nitrocyclopropanes has been achieved by a one-pot, four-step method catalyzed by (S)-diphenylprolinol TMS ether, which joins two sequential domino reactions, namely a domino sulfa-Michael/aldol condensation of α,β-unsaturated aldehydes with 1,4-dithiane-2,5-diol, and a domino Michael/α-alkylation reaction of the derivedchiral dihydrothiophenes with bromonitromethane