A New Family of Cinchona-Derived Bifunctional Asymmetric Phase-Transfer Catalysts: Application to the Enantio- and Diastereoselective Nitro-Mannich Reaction of Amidosulfones
作者:Kayli M. Johnson、Matt S. Rattley、Filippo Sladojevich、David M. Barber、Marta G. Nuñez、Anna M. Goldys、Darren J. Dixon
DOI:10.1021/ol300779x
日期:2012.5.18
family of bifunctional H-bond donor phase-transfer catalysts derived from cinchona alkaloids has been developed and evaluated in the enantio- and diastereoselective nitro-Mannich reaction of in situ generated N-Boc-protected imines of aliphatic, aromatic, and heteroaromatic aldehydes. Under optimal conditions, good reactivity and high diastereoselectivities (up to 24:1 dr) and enantioselectivities (up to
已经开发了新的金鸡纳生物碱类双官能H键供体相转移催化剂新家族,并在原位生成的N - Boc保护的脂族,芳族和杂芳族醛的N - Boc保护的亚胺的对映和非对映选择性硝基曼尼希反应中进行了评估。。在最佳条件下,使用具有3,5-bis的9-氨基-9-脱氧表庚啶衍生的相转移催化剂,可以获得良好的反应性和较高的非对映选择性(高达24:1 dr)和对映选择性(高达95%ee)。在9位的(三氟甲基)苯基脲H键供体基团。