Reaction of spiro(4H-3,1-benzoxazine-4,4'-piperidin)-2(1H)-one derivatives and related compounds with phosphorus oxychloride.
作者:HARUKI TAKAI、HIROYUKI OBASE、MASAYUKI TERANISHI
DOI:10.1248/cpb.34.1901
日期:——
Treatment of spiro[4H-3, 1-benzoxazine-4, 4'-piperidin]-2(1H)-one derivatives with POCl3 yielded 1, 2, 3, 4-tetrahydro-2, 9-diazaphenanthrene derivatives through a novel rearrangment. The reaction is suggested to processed via the formation of an isocyanate by dehydrative cleavage of the oxazinone ring with POCl3. It was also found that treatment of 4-(2-methoxycarbonylamino-phenyl)-1, 2, 5, 6-tetrahydropyridine derivatives with trichlorosilane/triethylamine gave the corresponding 10-oxo-1, 2, 3, 4, 9, 10-hexahydro-2, 9-diazaphenanthrene derivatives.
用 POCl3 处理螺[4H-3, 1-苯并恶嗪-4, 4'-哌啶]-2(1H)-酮衍生物,通过一种新的重排反应生成了 1, 2, 3, 4-四氢-2, 9-二氮菲衍生物。该反应是通过 POCl3 脱水裂解噁嗪酮环形成异氰酸酯而进行的。研究还发现,用三氯硅烷/三乙胺处理 4-(2-甲氧基羰基氨基苯基)-1,2,5,6-四氢吡啶衍生物,可得到相应的 10-氧代-1,2,3,4,9,10-六氢-2,9-二氮菲衍生物。