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
α-alkylation of unactivated amides with alcohols is described. Using a NCP-type pincer Ir complex as the precatalyst and KOtBu as the base, the reactions of secondary or tertiary acetamides with benzyl or nonbenzyl primary alcohols occur at 80 °C, furnishing the alkylation products in good yields. This method represents a practical and green means of α-alkylation of amides in a relatively mild, efficient
描述了未活化酰胺与醇的α-烷基化。使用NCP型夹钳Ir络合物作为前催化剂,并使用KO t Bu作为碱,仲或叔乙酰胺与苄基或非苄基伯醇的反应在80°C发生,提供了高收率的烷基化产物。该方法代表了以相对温和,有效和选择性的方式以低催化剂负载量(0.5mol%)进行酰胺的α-烷基化的实用和绿色手段。