A highly selective synthesis of (Z)-α,β-unsaturated ketones
摘要:
New Wadsworth-Emmons reagents, bis(2,2,2-trifluoroethyl)-(2-oxopropyl)phosphonate 6 and bis(2,2,2-trifluoroethyl)-(1-methyl-2-oxopropyl)-phosphonate 7 were prepared and their reactions with aldehydes yielded disubstituted and trisubstituted (Z)-alpha,beta-unsaturated ketones. (C) 1999 Elsevier Science Ltd. All rights reserved.
A Convenient Route to (<i>E</i>)-α,β-Unsaturated Methyl Ketones
作者:M. Bellassoued、J. Aatar、M. Bouzid、M. Damak
DOI:10.1080/10426500903348039
日期:2010.8.25
Aldehydes are converted into (E)-α,β-unsaturated methyl ketones in good yield and with a high E stereoselectivity using α,α-bis(trimethylsilyl) N-tert-butyl acetimine 3. The reaction was mediated by a catalytic amount of tetrabutylammonium fluoride (TBAF) under mild conditions. The disilylated reagent 3 is easily generated from N-tert-butylacetimine, lithium diisopropylamide (LDA), and chlorotrimethylsilane