Michael-type addition of phthalimide salts to chiral α,β-unsaturated imides
作者:Giuliana Cardillo、Angela De Simone、Luca Gentilucci、Piera Sabatino、Claudia Tomasini
DOI:10.1016/s0040-4039(00)73317-x
日期:1994.7
attack of several phthalimido derivatives in the presence of a Lewis acid. The reaction was studied in some details and chloromagnesium phthalimide afforded the better results with 95:5 diastereomeric ratio and 90% yield. Furthermore the resulting enolate was trapped performing the reaction in the presence of benzenesulfonyl bromide and the 2-bromo-3-phthalmido derivative 4 was obtained in good yield
Diastereoselective cycloaddition of chiral 1-acryloyl-2-imidazolidinone and o-quinodimethane generated by reduction of 1,2-bis(bromomethyl)benzene with zinc
作者:Naoki Kise、Ryousuke Mimura
DOI:10.1016/j.tetasy.2007.04.014
日期:2007.5
The reduction of 1,2-bis(bromomethyl) benzene with zinc powder followed by cycloaddition with the chiral dienophile (4R,5S)-1-acryloyl-3,4-dimethyl-5-phenyl-2-imidazolidinone in the presence of BF3 center dot Et2O under ultrasound irradiation gave the corresponding Diels-Alder cycloadduct in high yield (90%) and high diastereoselectivity (R:S = 87:13). (c) 2007 Elsevier Ltd. All rights reserved.