Development of a Practical and Efficient Synthesis of Chloromethyl 2-Ethoxy-2-methylpropanoate
作者:John A. Ragan、Nathan D. Ide、Weiling Cai、James J. Cawley、Roberto Colon-Cruz、Rajesh Kumar、Zhihui Peng、Brian C. Vanderplas
DOI:10.1021/op1002038
日期:2010.11.19
An efficient synthesis of chloromethyl 2-ethoxy-2-methylpropanoate from 2-bromoisobutyric acid is reported. Four developments were key to this route: (i) a mild, base-mediated ethanolysis of a tertiary alkyl bromide, (ii) a sodium bisulfite purge of 2-methylacrylic acid, (iii) preparation of a thiomethyl ester via a formal Pummerer process with DMSO, and (iv) improved conversion of a thiomethyl ester
据报道由2-溴异丁酸有效合成2-乙氧基-2-甲基丙酸氯甲基酯。该方法的关键在于四个发展:(i)叔烷基溴的轻度,碱介导的乙醇水解作用;(ii)2-甲基丙烯酸的亚硫酸氢钠吹扫;(iii)通过正式的Pummerer工艺制备硫代甲基酯用DMSO,以及(iv)通过抑制竞争性氯化途径改善了硫代甲基酯向氯代甲基酯的转化。