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.
Ni-Catalyzed α-Alkylation of Unactivated Amides and Esters with Alcohols by Hydrogen Auto-Transfer Strategy
作者:Siba P. Midya、Jagannath Rana、Jayaraman Pitchaimani、Avanashiappan Nandakumar、Vedichi Madhu、Ekambaram Balaraman
DOI:10.1002/cssc.201801443
日期:2018.11.23
A transition‐metal‐catalyzedborrowinghydrogen/hydrogen auto‐transfer strategy allows the utilization of feedstock alcohols as an alkylating partner, which avoids the formation of stoichiometric salt waste and enables a direct and benign approach for the construction of C‐N and C−C bonds. In this study, a nickel‐catalyzedα‐alkylation of unactivated amides and ester (tert‐butyl acetate) is carried
Mn-catalyzed C-alkylation of amides and tert-butyl acetate using alcohols as alkylating agents is reported. This approach exhibits a broad substrate scope providing the C(α)-alkylated amides in good yields via hydrogen auto-transfer strategy.
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。
Palladium-Catalyzed Hydrocarbonylative C–N Coupling of Alkenes with Amides
作者:Xibing Zhou、Guoying Zhang、Bao Gao、Hanmin Huang
DOI:10.1021/acs.orglett.8b00538
日期:2018.4.20
An efficient palladium-catalyzed hydrocarbonylative C–N coupling of alkenes with amides has been developed. The reaction was performed via hydrocarbonylation of alkenes, followed by acyl metathesis with amides. Both intermolecular and intramolecular reactions proceed smoothly to give either branched or linear amides in high turnover number (3500) with NH4Cl or NMP·HCl as a proton source under the palladium