作者:S. Shashidhar Reddy、B. George Vineel、S. Venkataiah、A. Naidu、P.K. Dubey
DOI:10.14233/ajchem.2014.17606
日期:——
Commercially available cyanoacetamide (1) was reacted with isopropylazide (2) in the presence of sodium ethoxide in ethanol at 80 °C for 36 h yielding 4-amino-3-isopropyl-3H-[1,2,3]triazolo-5-carboxamide (3) which on treatment with carbon disulphide and potassium hydroxide in ethanol-water under refluxing conditions at 80 °C for 48 h gave 3-isopropyl-5-mercapto-3H-[1,2,3] triazolo[4,5-d]pyrimidine-7-ol (4). The latter on treatment with methyl iodide in aqueous sodium hydroxide at 0 °C for 2 h resulted in 3-isopropyl-5-methanesulfanyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-ol (5). This was reacted with meta-chloroperbenzoic acid (m-CPBA) in dichloromethane at 0 °C for 6 h yielding 3-isopropyl-5-methanesulfonyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-ol (6). Compound 6 was reacted with SOCl2 in the presence of triethylamine at 75 °C for 6 h to obtain 7-chloro-3-isopropyl-5-methanesulfonyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine (7) which on condensation with D-prolinol (8) in ethanol at room temperature for 2 h resulted in (R)-[1-(5-methanesulfonyl-3-isopropyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-yl)pyrrolidine-2-yl-methanol (9). Compound 9 on treatment with anilines (10a-10g) in microwave oven at 130 °C just for 60 s gave (R)-[1-(5-arylamino-3-isopropyl-3H-[1,2,3]triazolo[4,5-d]pyrimidine-7-yl)pyrrolidine-2yl-methanol (11a-g). The latter, on treatment with polyphosphoric acid at 125 °C for 0.5 h, afforded a series of novel, chiral (R)-N-(3-isopropyl-7a,8,9,10[12:3,4]imidazolo [1,2c] [1,2,3]triazolo-[4,5-e]-pyrimidine-5- (7H)ylidine) aniline derivatives (12a-g).
商业可获得的
氰乙酰胺(1)在
乙醇中与异丙基
叠氮化物(2)在60 °C浸泡36小时,反应生成4-
氨基-3-异丙基-3H-[1,2,3]三唑-5-羧酰胺(3)。该化合物与
二硫化碳和
氢氧化钾在
乙醇-
水的回流条件下反应48小时,得到3-异丙基-5-
硫羟基-3H-[1,2,3]三唑[4,5-d]
嘧啶-7-醇(4)。随后,4与
碘甲烷在0 °C的
氢氧化钠水溶液中反应2小时,形成3-异丙基-5-甲基
硫基-3H-[1,2,3]三唑[4,5-d]
嘧啶-7-醇(5)。接着,5在0 °C的
二氯甲烷中与对
氯过
苯甲酸(m-CPBA)反应6小时,生成3-异丙基-5-甲基磺酰基-3H-[1,2,3]三唑[4,5-d]
嘧啶-7-醇(6)。化合物6在75 °C下与
氯化硫(SOCl2)和
三乙胺反应6小时,得到7-
氯-3-异丙基-5-甲基磺酰基-3H-[1,2,3]三唑[4,5-d]
嘧啶(7)。随后,将7与
D-脯氨醇(8)在室温下的
乙醇中缩合2小时,生成(R)-[1-(5-甲基磺酰基-3-异丙基-3H-[1,2,3]三唑[4,5-d]
嘧啶-7-基)
吡咯烷-2-基]
甲醇(9)。化合物9与一系列
苯胺(10a-10g)在微波炉中以130 °C加热60秒,得到了(R)-[1-(5-芳基
氨基-3-异丙基-3H-[1,2,3]三唑[4,5-d]
嘧啶-7-基)
吡咯烷-2-基]
甲醇(11a-g)。进一步地,11a-g在125 °C下与多
磷酸反应0.5小时,得到一系列新颖的手性(R)-N-(3-异丙基-7a,8,9,10[12:3,4]
咪唑[1,2c][1,2,3]三唑-[4,5-e]-
嘧啶-5-(7H)亚基)
苯胺衍
生物(12a-g)。