Quinazolines. Part XV. Hexahydro- and octahydro-quinazolines
作者:W. L. F. Armarego、Toshihiko Kobayashi
DOI:10.1039/j39710000238
日期:——
was shown to be a tautomeric mixture of the (1H)-one (20%) and (3H)-one (80%) in pH 9·2 aqueous buffer by comparing the u.v. spectrum with those of authentic 1- and 3-methyl derivatives. The preparations of cis- and trans-3,4,4a,5,6,7,8,8a-octahydroquinazoline hydrochlorides, 2-amino-3,4,4a,5,6,7,8,8a-octahydroquinazolin-4-ones, 2-amino-3,4,4a,5,6,7,8,8a-octahydroquinazoline salts, 2-oxo(1H) and 2-thio(1H)3
通过催化还原5,6,7,8-四氢喹唑啉得到的3,4,5,6,7,8-六氢喹唑啉在空气中缓慢地氧化为氯仿溶液中的起始原料,但在碱水溶液中却被降解为2-甲酰胺基甲基环己酮。反式-4a,5,6,7,8,8a-六氢喹唑啉-4(1-或3- H)-一显示为(1 H)-一(20%)和(3 H通过比较uv光谱与真实的1-甲基和3-甲基衍生物的uv光谱,在pH 9·2水性缓冲液中得到1(80%)。顺式和反式的制剂-3,4,4a,5,6,7,8,8a-八氢喹唑啉盐酸盐,2-amino-3,4,4a,5,6,7,8,8a-八氢喹唑啉-4-ones,2-amino- 3,4,4a,5,6,7,8,8a-八氢喹唑啉盐,2-氧代(1 H)和2-硫代(1 H)3,4,4a,5,6,7,8,8a-八氢喹唑啉,1,2,4a,5,6,7,8,8a-八氢喹唑啉-4(3 H)ones; 顺式-4a,5,6,7,8,8a-六氢喹唑啉-4(3