A highly diastereoselective and enantioselectiveBrønstedacidcatalyzedreductive condensation of N−H imines was developed. This reaction is catalyzed by a chiral disulfonimide (DSI), uses Hantzsch esters as a hydrogen source, and delivers useful C2‐symmetric secondary amines.
Aerobic/Room‐Temperature‐Compatible
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‐Block Organometallic Chemistry in Neat Conditions: A Missing Synthetic Tool for the Selective Conversion of Nitriles into Asymmetric Alcohols
Under neat conditions: The aerobic and room temperature compatible double addition of s-block organometallic reagents into nitriles, in the absence of any external organic solvent, is reported. Thus, directconversion of nitriles into asymmetric tertiary alcohols is achieved through a one-pot/two-steps modular process, without tedious and energy consuming halfway isolation/purification steps needed
Under neat conditions :报道了在没有任何外部有机溶剂的情况下,s-嵌段有机金属试剂在有氧和室温下相容的双重加成到腈中。因此,通过一锅/两步模块化工艺将腈直接转化为不对称叔醇,无需繁琐且耗能的中途分离/纯化步骤。
Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Reductive Coupling of Ketimines Templated by Chiral Diborons
作者:Mingkang Zhou、Yaodong Lin、Xiao‐Xuan Chen、Guangqing Xu、Lung Wa Chung、Wenjun Tang
DOI:10.1002/anie.202300334
日期:——
A series of chiral vicinaltetrasubstituted diamines are prepared with high ee values and good to excellent yields via an unprecedented chiral diboron-templated asymmetric homocoupling of aryl alkyl ketimines. The synthetic value of these chiral vicinaltetrasubstituted diamines is demonstrated by the development of efficient organocatalysts for the asymmetric α-bromination of aliphatic aldehydes.
通过前所未有的手性二硼模板化芳基烷基酮亚胺的不对称自偶联,制备了一系列具有高 ee 值和良好至极佳产率的手性邻位四取代二胺。这些手性邻位四取代二胺的合成价值通过开发用于脂肪醛不对称α-溴化的高效有机催化剂得到证明。