Cyclization reactions of 8-(β-haloethylthio) adenine, 8-(β-haloethylamino) adenines and 8-(γ-halopropylamino) adenine occurred at both of N7 and N9 of purine ring and pairs of cyclized compounds, 4-aminodihydrothiazolo [2, 3-f]-and 4-aminodihydrothiazolo [3, 2-e] purine, 4-aminodihydroimidazo [2, 1-f]-and 4-aminodihydroimidazo [1, 2-e] purines, and 4-aminotetrahydropyrimido [2, 1-f]-and 4-aminotetrahydropyrimido [1, 2-e] purine were obtained. Structures of 4-aminodihydrothiazolopurines were determined by desulfurization with Rany Ni and those of 4-aminodihydroimidazopurines and 4-aminotetrahydropyrimidopurines were determined by comparison of spectral data with those of N-cyclonucleosides.
8-(β-卤代乙
硫基)
腺嘌呤、8-(β-卤代乙
氨基)
腺嘌呤和 8-(γ-卤代丙基
氨基)
腺嘌呤在
嘌呤环的 N7 和 N9 处发生了环化反应,并生成了成对的环化化合物:4-
氨基二氢
噻唑并 [2、3-f]-和 4-
氨基二氢
噻唑并[3,2-e]
嘌呤、4-
氨基二氢
咪唑并[2,1-f]-和 4-
氨基二氢
咪唑并[1,2-e]
嘌呤以及 4-
氨基四氢
嘧啶并[2,1-f]-和 4-
氨基四氢
嘧啶并[1,2-e]
嘌呤。4-aminodihydrothiazolopurines 的结构是通过 Rany Ni 的脱
硫作用确定的,而 4-aminodihydroimidazopurines 和 4-aminotetrahydropyrimidopurines 的结构则是通过与 N-环核苷的光谱数据比较确定的。