Asymmetric Mannich-type reactions with a chiral acetate: effect of Lewis acid on activation of aldimine
作者:Susumu Saito、Keiko Hatanaka、Hisashi Yamamoto
DOI:10.1016/s0040-4020(00)01042-5
日期:2001.1
addition. This scope was expanded to the asymmetric process using the chiral acetate, which has optically pure 2,6-bis(2-isopropylphenyl)-3,5-dimethylphenol as a chiralauxiliary with axial chirality. A Lewis acid additive is likely to have a complementary role in the pronounced activation of imine functionalities in the Mannich-type addition of the bulky chiral acetate.
A stereoselective, multiple-component approach to α–β-substituted-β-amino carbonyl derivatives
作者:Avrum L. Joffe、Timothy M. Thomas、James C. Adrian
DOI:10.1016/j.tetlet.2004.04.170
日期:2004.6
A new stereoselective multiple-component condensation is presented. This three-component condensation combines an aldehyde. aniline. and chlorotitanium enolates, to afford alpha-beta-substituted-beta-amino carbonyl compounds as its core structure. (C) 2064 Elsevier Ltd. All right reserved.