有机化学 ›› 2017, Vol. 37 ›› Issue (7): 1830-1834.DOI: 10.6023/cjoc201703042 上一篇    下一篇

研究简报

镍催化烷基羧酸与对甲苯磺酸甲酯还原偶联甲基化成酮反应

顾君a, 刘建东b, 孙雨人a, 王洪宇b   

  1. a. 上海大学材料科学与工程学院 上海 200444;
    b. 上海大学理学院化学系 上海 200444
  • 收稿日期:2017-03-24 修回日期:2017-04-16 发布日期:2017-05-17
  • 通讯作者: 王洪宇 E-mail:wanghy@shu.edu.cn
  • 基金资助:

    国家自然科学基金(No.61204020)和上海市教委创新(No.15ZZ047)资助项目.

Nickel-Catalyzed Reductive Methylation of Alkyl Acid with Methyl p-Tosylate

Gu Juna, Liu Jiandongb, Sun Yurena, Wang Hongyub   

  1. a. School of Materials Science and Engineering, Shanghai University, Shanghai 200444;
    b. Department of Chemistry, Shanghai University, Shanghai 200444
  • Received:2017-03-24 Revised:2017-04-16 Published:2017-05-17
  • Contact: 10.6023/cjoc201703042 E-mail:wanghy@shu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No.61204020) and the Innovation Program of Shanghai Municipal Education Commission (No.15ZZ047).

甲基是最小的含碳取代基团,在化合物中起到重要的作用.羧酸转化为酮是有机化学的基础反应,这种官能团变化通常是间接地将羧酸先转化为酰氯或者Weinreb酰胺再由有机金属试剂进行亲核进攻.直接将羧酸转变为酮,需要至少2 equiv.锂试剂,同时反应需要在低温下进行,往往伴随着很多叔醇的副产物.报道了利用镍催化还原偶联的方法,将有机羧酸与对甲苯磺酸甲酯进行还原偶联,一步反应直接由羧酸甲基化成酮,其特点是原料易得,反应条件温和,可以得到中等的收率并且有较好的底物适应性.

关键词: 甲基化, Ni催化, 芳香羧酸, 还原偶联

Methyl group is the smallest carbon substituent that plays important roles in many compounds. Conversion of a carboxylic acid into a ketone is a fundamental transformation in organic chemistry. This functional group change is usually performed indirectly by activating the carboxylic acid into an acyl chloride or into a Weinreb amide, and then by nucleophilic attack with an organometallic reagent. However, direct conversion of a carboxylic acid into a ketone can be achieved in one-step reaction using at least 2 equiv. of an organolithium reagent at low temperature and producing much tertiary alcohol. Herein, methylation of alkyl acid under Ni-catalyzed reductive coupling conditions using methyl p-methyl tosylate as the methylation reagent was reported to yield methylated ketones. Moderate yields as well as good functional group tolerance were observed under the present mild and easy-to-operate reaction conditions.

Key words: methylation, nickel-catalyzed, alkyl acid, reductive coupling