A One-Step Synthesis of Alkyl 2-Oxo-3-alkenoates from Alkenyl Grignard Reagents and Dialkyl Oxalates
作者:M. Rambaud、M. Bakasse、G. Duguay、J. Villieras
DOI:10.1055/s-1988-27642
日期:——
The reaction of alkenyl Grignard reagents with dialkyl oxalates at 80°C in an ether/tetrahydrofuran mixture (1:1) leads to the formation of the corresponding alkyl 2-oxo-3-alkenoates in high yields. Thus a mild and convenient one-step synthesis of 3-isopropenyl-substituted 2-oxoesters is described.
The present invention is directed to a method for purifying pyruvic acid compounds, which method comprises reacting a pyruvic acid compound of general formula (I):
wherein R1 is an optionally substituted lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cycloalkyl group, an aryl group, or a heterocyclic group, and R2 is a lower alkyl group, with a bisulfite of general formula (II):
MHSO3 (II)
wherein M is NH4 or an alkali metal, to give a bisulfite adduct of the pyruvic acid compound and then decomposing the adduct with an acid. According to the present invention, pyruvic acid compounds can be purified by simple and easy procedures without using purification techniques such as distillation or column chromatography, and the above method is advantageous as a process for the production on an industrial scale.
本发明涉及一种纯化丙酮酸化合物的方法,该方法包括使通式(I)的丙酮酸化合物反应:
其中 R1 是任选取代的低级烷基、低级烯基、低级炔基、环烷基、芳基或杂环基,R2 是低级烷基,与通式(II)的亚硫酸氢盐反应:
MHSO3 (II)
其中 M 为 NH4 或碱金属,以得到丙酮酸化合物的亚硫酸氢盐加合物,然后用酸分解该加合物。根据本发明,丙酮酸化合物可以通过简单易行的程序进行纯化,而无需使用蒸馏或柱层析等纯化技术,上述方法作为一种工业规模的生产工艺是非常有利的。
221. Studies related to cephalosporin C. Part III. A synthetical route to 6H-1,3-thiazines and the synthesis of a new fragmentation product of a cephalosporanic acid derivative
作者:S. H. Eggers、V. V. Kane、G. Lowe
DOI:10.1039/jr9650001262
日期:——
Bakasse, M.; Rambaud, M.; Bourrigaud, J., Synthetic Communications, 1988, vol. 18, # 10, p. 1043 - 1060
作者:Bakasse, M.、Rambaud, M.、Bourrigaud, J.、Villieras, J.、Duguay, G.