Sequential three-component synthesis of 1,4-bis[6,9-dihydro-6-oxo-9-phenyl-1<i>H</i>-purin-2-yl]piperazines
作者:Zheng Dong Fang、Di Fang、Quan Cheng
DOI:10.3184/174751912x13505755737168
日期:2012.12
synthesis of 1,4-bis[6,9-dihydro-6-oxo-9-phenyl-1H-purin-2-yl]piperazines by a domino three-component process involves an aza-Wittig reaction/heterocyclisation in the presence of sodium ethoxide as catalyst. Ethyl 1-phenyl-5-[(triphenylphosphoranylidene)amino]-1H-imidazole-4-carboxylate reacted with aromatic isocyanate to give carbodiimide intermediates, followed by addition of piperazines to give the
一种通过多米诺三组分工艺合成 1,4-双 [6,9-二氢-6-氧代-9-苯基-1H-嘌呤-2-基]哌嗪的简单一锅高效方法涉及氮杂- 在乙醇钠作为催化剂存在下的 Wittig 反应/杂环化。1-苯基-5-[(三苯基亚膦基)氨基]-1H-咪唑-4-羧酸乙酯与芳香族异氰酸酯反应得到碳二亚胺中间体,然后加入哌嗪得到相应的胍中间体。胍中间体在催化量的乙醇钠存在下环化,以良好的收率得到 1,4-双(6,9-二氢-6-氧代-9-苯基-1H-嘌呤-2-基)哌嗪衍生物.