Synthesis of 6-C-substituted 9-tetrahydrofuranylpurine derivatives.
作者:Norimitsu HAMAMICHI、Tadashi MIYASAKA
DOI:10.1248/cpb.38.2018
日期:——
6-Dicyanomethylene-9-tetrahydrofuranylpurine (4), which was obtained by the reaction of 9H-1, 6-dihydropurine-Δ6, α-propanedinitrile (3) with 2, 3-dihydrofuran, has been catalytically hydrogenated to the α-(aminomethylene)-9-(tetrahydrofuran-2-yl)-9H-purine-6-acetonitrile (5) in good yield using N, N-dimethylformamide-benzene as a solvent over Pd-C under medium pressure. Substitution of 5 with amines gave the corresponding alkylaminomethylene purines (6 and 7). Reaction of 5 with hydrazine gave the pyrazole derivative (8).
6-二氰基亚甲基-9-四氢呋喃基嘌呤(4)由9H-1,6-二氢嘌呤-Δ6,α-丙二腈(3)与2,3-二氢呋喃反应得到,在Pd-C催化剂催化下,以N,N-二甲基甲酰胺-苯为溶剂,在中压下,氢化生成α-(氨基亚甲基)-9-(四氢呋喃-2-基)-9H-嘌呤-6-乙腈(5),收率良好。用胺取代5得到相应的烷基氨基亚甲基嘌呤(6和7)。5与肼反应得到吡唑衍生物(8)。