Directed lithiation of 3,5-dichloroaniline and its application in the synthesis of 1,3-dichloro-6,7,8,9,10,12-hexahydroazepino[2,1-b][5-14C]quinazoline monohydrochloride
作者:I. Victor Ekhato、Che C. Huang
DOI:10.1002/jlcr.2580340603
日期:1994.6
1,3-Dichloro-6,7,8,9,10,12-hexahydroazepino[2,1-b][5-14C]quinazoline monohydrochloride (1) was synthesized in 12% overall yield starting from 3,5-dichloroaniline, and a radiochemical purity of 99.6% was obtained. The synthetic sequence was facilitated by the regio-controlled preparation of 4,6-dichloroanthranilic acid (3) from 3,5-dichloroaniline using the t-butoxycarbonyl-protected aniline and t-
1,3-二氯-6,7,8,9,10,12-六氢氮杂[2,1-b][5-14C]喹唑啉单盐酸盐 (1) 以 12% 的总收率从 3,5-二氯苯胺开始合成,放射化学纯度为 99.6%。通过使用叔丁氧基羰基保护的苯胺和叔丁基锂/四甲基乙二胺 (t-BuLi/TMEDA) 组合,从 3,5-二氯苯胺中区域控制制备 4,6-二氯邻氨基苯甲酸 (3),促进了合成顺序通过羧化。喹唑啉一氯化物 1 由 3 与 1-氮杂-2-甲氧基-环庚烯缩合然后还原而构成。