Tetracyclic benzodiazepines. 3. Synthesis of the 2,3-dihydro-1h-quino[1,8-ab][1,5]benzodiazepine ring system, and derivatives of potential biological interest
作者:Edward J. Glamkowski、Yulin Chiang
DOI:10.1002/jhet.5570240337
日期:1987.5
The synthesis of the 2,3-dihydro-1H-quino[1,8-ab][1,5]benzodiazepine ring system is described. The key step involves a Bischler-Napieralski type cyclization of the formamide 3. This was achieved by refluxing in phosphorus oxychloride to effect a cyclodehydration to form the seven-membered central ring. A subgroup of 1H-quinobenzodiazepines bearing a pendant N-methylpiperazine substituent was synthesized
描述了2,3-二氢-1 H-喹[1,8- ab ] [1,5]苯并二氮杂pine环系统的合成。关键步骤涉及甲酰胺3的Bischler-Napieralski型环化。这是通过在三氯氧化磷中回流以实现环脱水以形成七元中心环来实现的。通过类似的6型尿素的环化反应,合成了带有侧链N-甲基哌嗪取代基的1 H-喹啉苯并二氮杂亚类。这些衍生物7在结构上与抗精神病药氯氮平有关。