Tetrabenzylhafnium as a New Organometallic Reagent for Imine Addition Resulting in α-Branched Amines
作者:Haibo Mei、Xiaoyun Ji、Jianlin Han、Yi Pan
DOI:10.1002/ejoc.201100820
日期:2011.10
Tetrabenzylhafnium has been explored as a new organometallicreagent for the imine addition reaction. This reagent tolerates a wide scope of imines, affording α-branched amines in excellent yields without the use of any additive or catalyst. This new reagent shows higher efficiency than that observed for classic Grignard and organolithium reagents.
Ring-opening of epoxides furnishing either linear or branched products belongs to the group of classic transformations in organic synthesis. However, the regioselective cross-electrophile coupling of aryl epoxides with aryl halides still represents a key challenge. Herein, we report that the vitamin B12/Ni dual-catalytic system allows for the selective synthesis of linear products under blue-light
提供线性或支化产物的环氧化物的开环属于有机合成中的经典转化组。然而,芳基环氧化物与芳基卤化物的区域选择性交叉亲电偶联仍然是一个关键挑战。在此,我们报告了维生素 B 12 /Ni 双催化系统允许在蓝光照射下选择性合成线性产物,从而补充获得支化醇的方法。实验和理论研究证实了所提出的涉及烷基钴胺素作为该反应中间体的机制。
Benzylation of Imines with Activated Boronate Nucleophiles
作者:Michael R. Hollerbach、Jacob C. Hayes、Timothy J. Barker
DOI:10.1002/ejoc.201801804
日期:2019.2.21
Benzylation reactions of N-tosyl imines and N-tert-butanesulfinyl imines using benzylboronic acid pinacol ester are reported. s-Butyllithium was used to activate the boronic ester, rendering it nucleophilic. The reaction was compatible with electronically diverse substituents on the imine in both substrate classes. Good diastereoselectivity was observed in additions to N-tert-butylsulfinylaldimines