Pyrimidines. LI. Synthesis of pyrimido(1,6-a)benzimidazole-1,3(2H,5H)-dione derivatives by the reaction of 6-chloro-2H-1,3-oxazine-2,4(3H)-diones with o-phenylenediamines.
作者:MOTOI YOGO、KOSAKU HIROTA、SHIGEO SENDA
DOI:10.1248/cpb.32.3695
日期:——
The reaction of 6-chloro-1, 3-oxazine-2, 4-diones (1) with o-phenylenediamines (2) in the presence of acetic acid afforded pyrimido [1, 6-α] benzimidazole-1, 3 (2H, 5H)-dione derivatives (3) via a 1, 3-oxazine-to-pyrimidine ring transformation.
6-chloro-1, 3-氧杂环丁烷-2, 4-二酮(1)与邻苯二胺(2)在醋酸存在下反应,经过1, 3-氧杂环丁烷转变为嘌呤环,得到嘧啶[1, 6-α]苯并咪唑-1, 3 (2H, 5H)-二酮衍生物(3)。