An Adverse Effect of Higher Catalyst Loading and Longer Reaction Time on Enantioselectivity in an Organocatalytic Multicomponent Reaction
作者:Tushar M. Khopade、Trimbak B. Mete、Jyotsna S. Arora、Ramakrishna G. Bhat
DOI:10.1002/chem.201800278
日期:2018.4.20
An enantioselective organocatalytic multicomponent reaction of aldehydes, ketones, and Meldrum's acid has been developed. A cinchona‐based primary amine (1 mol %) catalyses the multicomponent reaction via the formation of the Knoevenagel product and a chiral enamine to form enantiopure δ‐keto Meldrum's acids in a tandem catalytic pathway. An adverse effect of higher catalyst loading and longer reaction
ZHONG, QI;SHAO, JIAN-GUO;LIU, CHANG-QING, YUTSZI XUASYUEH, 8,(1988) N 5, S. 466-469
作者:ZHONG, QI、SHAO, JIAN-GUO、LIU, CHANG-QING
DOI:——
日期:——
Michael addition approach for the synthesis of novel spiro compounds and 2-substituted malonic acid derivatives from Meldrum’s acid
作者:Madhukar S. Chande、Rahul R. Khanwelkar
DOI:10.1016/j.tetlet.2005.09.030
日期:2005.11
Novel routes for the synthesis of spiro derivatives of Meldrum’s acid and 2-substituted malonicacid derivatives have been developed. Meldrum’s acid was monoalkylated using a Michael addition reaction. Mono-Michael adducts were then alkylated using substituted haloalkanes, which on condensation gave spiro derivatives of Meldrum’s acid. Bis Michael addition of Meldrum’s acid with 1,5-diaryl-1,4-pentadien-3-one