Enantioselective catalytic addition of nitroesters to N-carboalkyloxy imines: a route to quaternary stereocenters
作者:Alessandra Puglisi、Laura Raimondi、Maurizio Benaglia、Martina Bonsignore、Sergio Rossi
DOI:10.1016/j.tetlet.2009.05.036
日期:2009.7
A readily available, low cost bifunctional organic catalyst promoted the addition of nitroesters to imines; in the reaction between 2-nitropropionates and N-Boc protected aldehyde-imines the product bearing a new quaternary stereocenter was obtained in up to 81% ee. The positively charged catalyst was postulated to control the attack of the enolic form of nitroester to imine through a hydrogen bonding
一种易于获得的低成本双功能有机催化剂促进了亚硝酸酯类向亚胺中的添加。在2-硝基丙酸酯与N - Boc保护的醛-亚胺之间的反应中,获得具有新的季立体中心的产物,其收率高达81%ee。假定带正电荷的催化剂通过氢键网络控制硝基酯的烯醇形式对亚胺的攻击。