silyl ketene acetal 是什么? ca给出的应该是正确的 但 conjugate addition of a silyl ketene acetal to α,β‐unsaturated lactones authors: gnaneshwar, rudhramyna 1 ; sivaram, swaminathan 1 source: synthetic communications , volume 36, number 7, number 7/2006 , pp. 885-890(6) ublisher: taylor and francis ltd | next article | view table of contents key: - free content - new content - subscribed content - free trial content 复制代码 abstract: conjugate addition of a silyl ketene acetal [me 2 c=c (ome)osime 3 ] to a,ß-unsaturated lactones (namely, 5,6-dihydro-2 h -pyran-2-one, 2(5 h )-furanone as michael acceptor) occurs efficiently at room temperature in the presence of a nucleophilic catalyst, tetra - n -butyl ammonium bibenzoate (tbabb), in thf as well as lewis acid catalysts such as yb(otf) 3 and i 2 in ch 2 cl 2 , giving the corresponding 1,4-adducts in excellent yields. keywords: 1,4‐addition ; conjugate addition ; cyclic α,β‐unsaturated esters ; electrophile ; lewis acid ; michael acceptor ; michael addition ; mukaiyama–michael addition ; o ‐silylated ketene acetal ; nucleopilic catalyst document type: research article doi: 10.1080/00397910500466058 affiliations: 1: division of polymer science and engineering, national chemical laboratory, pune, india 查看更多
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