Expedient Synthesis of Chiral 1,2- and 1,4-Diamines: Protecting Group Dependent Regioselectivity in Direct Organocatalytic Asymmetric Mannich Reactions
作者:Naidu S. Chowdari、Moballigh Ahmad、Klaus Albertshofer、Fujie Tanaka、Carlos F. Barbas
DOI:10.1021/ol060980d
日期:2006.6.1
[reaction: see text] Organocatalytic asymmetric Mannich reaction of protected amino ketones with imines in the presence of an L-proline-derived tetrazole catalyst afforded diamines with excellent yields and enantioselectivities of up to 99%. The amino ketone protecting group controlled the regioselectivity of the reaction providing access to chiral 1,2-diamines from azido ketones and 1,4-diamines from
[反应:见正文]在L-脯氨酸衍生的四唑催化剂存在下,受保护的氨基酮与亚胺的有机催化不对称曼尼希反应提供了优异的收率和高达99%的对映选择性的二胺。氨基酮保护基控制反应的区域选择性,从而提供了来自叠氮基酮的手性1,2-二胺和邻苯二甲酰亚胺基酮的1,4-二胺的通道。