A simple catalyst of Ni(OAc)2 and P(t-Bu)3 enables selective C-alkylation of thioacetamides and primary acetamide with alcohols for the first time. Monoalkylation of thioamides, amides and t-butyl esters occurs in excellent yields (>95%). Mechanistic studies reveal that the reaction proceeds via a hydrogen autotransfer pathway.
Bidentate Ru(II)‐NC Complexes as Catalysts for
<i>α</i>
‐Alkylation of Unactivated Amides and Esters
作者:Dawei Gong、Bowen Hu、Weiwei Yang、Dafa Chen
DOI:10.1002/cctc.201901319
日期:2019.10.7
Five Ru(II)‐NC complexes were tested as catalysts for α‐alkylation of unactivated amides using alcohols as alkylating agents, and complex (C5H4N)‐(C6H4)}RuCl(CO)(PPh3)2 (1) showed the highest activity. With 0.5 mol% catalyst loading, a series of α‐alkylated amides were isolated at 80 °C within 6 hours. Furthermore, under similar conditions, complex 1 was also active for α‐alkylation of unactivated
测试了五种Ru(II)-NC配合物作为使用醇作为烷基化剂的未活化酰胺的α-烷基化的催化剂,配合物(C 5 H 4 N)-(C 6 H 4)} RuCl(CO)(PPh 3)2(1)显示最高活性。在催化剂负载量为0.5 mol%的情况下,在80°C下于6小时内分离出一系列α烷基化的酰胺。此外,在相似的条件下,配合物1对未活化酯与醇的α烷基化反应也具有活性,反应时间缩短至1.5小时。1的催化性能 与报道得最好的催化剂相当。
A General and Mild Catalytic α-Alkylation of Unactivated Esters Using Alcohols
Catalyticα‐alkylation of esters with primary alcohols is a desirable process because it uses low‐toxicity agents and generates water as the by‐product. Reported herein is a NCP pincer/Ir catalyst which is highlyefficient for α‐alkylation of a broad scope of unactivated esters under mild reaction conditions. For the first time, alcohols alkylate unactivated α‐substituted acyclic esters, lactones,
Borrowing hydrogen: a catalytic route to C–C bond formation from alcohols
作者:Michael G. Edwards、Rodolphe F. R. Jazzar、Belinda M. Paine、Duncan J. Shermer、Michael K. Whittlesey、Jonathan M. J. Williams、Dean D. Edney
DOI:10.1039/b312162c
日期:——
Ruthenium complexes have been shown to perform efficient transfer hydrogenation reactions between alcohols and alkenes; in combination with an in situ Wittig reaction, indirectformation of C-Cbonds has been achieved fromalcohols.