Late-Stage Diversification of Chiral N-Heterocyclic-Carbene Precatalysts for Enantioselective Homoenolate Additions
作者:Pinguan Zheng、Chenaimwoyo A. Gondo、Jeffrey W. Bode
DOI:10.1002/asia.201000617
日期:2011.2.1
A library of chiral triazolium salts has been prepared by late‐state diversification of a triazolium amine salt. By utilizing a primary amine as a functional handle, a single triazolium salt can be transformed into a variety of chiral N‐heterocyclic carbene precatalysts. This approach makes the preparation of chiral N‐heterocyclic carbenes possible by a single‐step modification of a triazolium salt
通过三唑胺盐的后期多样化制备了手性三唑盐库。通过利用伯胺作为功能手柄,单一的三唑盐可以转化为多种手性N-杂环卡宾预催化剂。这种方法使得通过三唑鎓盐的一步修饰来制备手性N-杂环卡宾成为可能,而不是通常需要多步有机合成和为催化剂库的每个成员形成具有挑战性的杂环。我们筛选了这些催化剂,用于控制 α,β-不饱和醛和环状酮亚胺之间的 γ-内酰胺形成反应中的非对映选择性和对映选择性。