Comparative Studies of Cathodically-Promoted and Base-Catalyzed Michael Addition Reactions of Levoglucosenone
作者:Alexander V. Samet、Murat E. Niyazymbetov、Victor V. Semenov、Andrei L. Laikhter、Dennis H. Evans
DOI:10.1021/jo961019g
日期:1996.1.1
Regioselective Michael addition of nitro and heterocyclic compounds to levoglucosenone, 1, is effectively catalyzed by amines and also by cathodic electrolysis. In comparison to the base-catalyzed reaction, it was found that under electrochemical conditions the reaction proceeds under milder conditions and with higher yields. Cathodically-initiated Michael addition of thiols to levoglucosenone using small currents
Abstract The Michael-addition reactions of levoglucosenone with diethyl malonate, ethyl cyanoacetate, 2-nitropropane, and 2-methylcyclohexanone have been examined, using a variety of catalysts. This reaction may be conveniently used to prepare, in reasonable yields, 4-substituted levoglucosenone derivatives having the d - erythro configuration. Better yields of the diethyl malonate adduct were obtained