Triazolo(4,5-d)pyrimidines. XII. Reactions of 6-Benzoyl-6,7-dihydro-3-phenyl-3H-1,2,3-triazolo(4,5-d)pyrimidines(Triazolopyrimidine Reissert Compounds) with Acid, Base, and Electrophile.
作者:Ken-ichi TANJI、Susumu SATO、Yoshihiko KANAMARU、Chihoko IIJIMA、Akira MIYASHITA、Takeo HIGASHINO
DOI:10.1248/cpb.40.513
日期:——
In the treatment of 6-benzoyl-6, 7-dihydro-3-phenyl-3H-1, 2, 3-triazolo[4, 5-d]pyrimidine-7-carbonitrile (1, triazolo-pyrimidine Reissert compound) and 6-benzoyl-6, 7-dihydro-5-methyl-3-phenyl-3H-1, 2, 3-triazolo[4, 5-d]pyrimidine-7-carbonitrile (2, 5-methyltriazolopyrimidine Reissert compound) with an acid, the ring fission of the pyrimidine ring proceeded to give the triazole derivatives (3-7). Alkaline hydrolysis of 2 and 1 gave 5-metyl-3-phenyl- (10) and 3-phenyl-3H-1, 2, 3-triazolo[4, 5-d]pyrimidines (9), respectively. The anions, generated from 1 and 2 with sodium hydride (NaH), underwent aromatization to give the 3H-1, 2, 3-triazolo[4, 5-d]pyrimidine-7-carbonitriles (12 and 14). Compounds 1 and 2 reacted with arylaldehydes in the presence of NaH to give corresponding 3H-1, 2, 3-triazolo[4, 5-d]pyrimidin-7-ylmethyl benzoates (15 and 17).
在用酸处理6-苯甲酰基-6, 7-二氢-3-苯基-3H-1, 2, 3-三唑并[4, 5-d]嘧啶-7-腈(1,三唑嘧啶Reissert化合物)和6-苯甲酰基-6, 7-二氢-5-甲基-3-苯基-3H-1, 2, 3-三唑并[4, 5-d]嘧啶-7-腈(2,5-甲基三唑嘧啶Reissert化合物)时,嘧啶环开环反应得到了三唑衍生物(3-7)。2和1的碱水解分别得到了5-甲基-3-苯基-(10)和3-苯基-3H-1, 2, 3-三唑并[4, 5-d]嘧啶(9)。由1和2与氢化钠(NaH)生成的阴离子发生了芳构化,得到了3H-1, 2, 3-三唑并[4, 5-d]嘧啶-7-腈(12和14)。化合物1和2在NaH存在下与芳香醛反应,得到了相应的3H-1, 2, 3-三唑并[4, 5-d]嘧啶-7-基甲基苯甲酸酯(15和17)。