studied. Irradiation of 5-alkyl-6-azidouracils (3) in the presence of amines caused a ring expansion to give 1,3,5-triazepine derivatives (7). Photolysis of 6-azido-1,3,5-trimethyluracil (3a) in alcohols gave the corresponding 6,6-dialkoxy-5-amino-5,6-dihydrouracils (8). When compound (3a) was irradiated in water, a ring contraction occurred to afford 3,5-dimethylhydantoin (9). On the other hand, 6-azido-5-cyano-1
已经研究了在亲核试剂存在下5-取代的6-
叠氮尿
嘧啶衍
生物的光解作用。在胺存在下照射5-烷基-6-
叠氮基
嘧啶(3)引起环膨胀,得到1,3,5-三氮杂pine衍
生物(7)。6-
叠氮基-1,3,5-三甲基尿
嘧啶(3a)在醇中的光解得到相应的6,6-二烷氧基-5-
氨基-5,6-二氢尿
嘧啶(8)。将化合物(3a)用
水照射时,发生环收缩,得到3,5-二甲基乙内酰
脲(9)。另一方面,仅在醇存在下,将6-
叠氮基-5-
氰基-1,3-二甲基尿
嘧啶(4)转化为1,3,5-三氮杂a(13)。