Chiral sulfamide-catalyzed asymmetric Michael addition of protected 3-hydroxypropanal to β-nitrostyrenes
作者:Simone Tortoioli、Sergio Bacchi、Cecilia Tortoreto、John B. Strachan、Alcide Perboni
DOI:10.1016/j.tetlet.2012.01.072
日期:2012.4
Organocatalytic asymmetric Michael addition of 3-(OTBS)-propanal to β-nitrostyrenes catalyzed by chiral sulfamides was investigated. Good d.r. (up to 80:20) and excellent enantioselectivities (up to >99% ee) were achieved. Both the N-[(1R,2R)-2-aminocyclohexyl]-N’-(phenylmethyl)sulfamide 7b and the novel chiral N-[(1R,2R)-2-aminocyclohexyl]-N’-[3,5-bis(trifluoromethyl)phenyl]sulfamide 7a were identified
研究了手性磺酰胺催化的3-(OTBS)-丙醛向β-硝基苯乙烯的有机催化不对称迈克尔加成反应。获得了良好的博士(高达80:20)和出色的对映选择性(高达> 99%ee)。两者Ñ - [(1 - [R,2 - [R)-2-氨基环己基] - ñ ' - (苯基甲基)硫酰胺7B和新型手性ñ - [(1 - [R,2 - [R)-2-氨基环己基] - ñ ' - [ 3,5-双(三氟甲基)苯基]磺酰胺7a被鉴定为有效的伯胺有机催化剂。