反应详情

A solution of 9 g of 2-amino-3-chloro-quinoxaline [prepared by heating under pressure 2,3-dichloro-quinoxaline and ammonia in ethanol by method of Saikachi et al (Chem. Pharm. Bull. Tokyo (1961), Vol. 9, p. 941], 12 g of ethyl bromopyruvate and 180 ml of dimethoxy ethane was stirred overnight and was filtered to obtain 5.33 of 2-amino-1-carbethoxycarbonylmethyl-3-chloro-quinoxalinium bromide in the form of a pale yellow crystalline solid. The filtrate was held in a refrigerator for 2 days to obtain 2 more crops of 1.20 and 3.62 g of product for a total yield of 10.22 g.

1. filtrationwas filtered