Facile Construction of Vicinal Quaternary and Tertiary Stereocenters via Regio- and Stereoselective Organocatalytic Michael Addition to Nitrodienes
作者:Pankaj Chauhan、Swapandeep Singh Chimni
DOI:10.1002/adsc.201100618
日期:2011.11
protocol for the synthesis of vicinal quaternary and tertiary stereocenters has been developed. The 6′-OH Cinchona alkaloids (BnCPN or BnCPD) at low catalyst loading (0.5–5 mol%) catalyze the Michael addition of trisubstituted carbon nucleophiles to nitrodienes in good to excellent yield (up to >99), high enantioselectivity (up to 99% ee) and high diastereoselectivity (up to >99:1 dr) under mild reaction
已经开发出用于合成邻近的第四级和第三级立体中心的高度区域选择性和立体选择性的方案。低催化剂负载量(0.5-5 mol%)下的6'-OH金鸡纳生物碱(BnCPN或BnCPD)催化三取代碳亲核试剂向硝基二烯的迈克尔加成反应,具有良好至优异的产率(高达> 99),高对映选择性(高达在温和的反应条件下,具有99%ee)和高非对映选择性(高达> 99:1 dr)。