An efficient synthesis of 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐
d
]pyrimidines using zinc chloride/triethylamine reagent system
摘要:
Abstractmagnified imageThe one‐pot synthesis of 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐d]pyrimidines is described. The reactions of 2‐benzamido‐4,5‐dihydro‐3‐furan(and ‐3‐thiophene)carbonitriles 1a‐d and 2a‐c with ethanol and/or methanol in the presence of zinc chloride and triethylamine gave the corresponding 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐d]pyrimidines 3a‐d, 4a‐d, 5a‐c and 6a‐c.
Synthesis and reactions of<i>n</i>-methyl-4-(methylthio)thieno[2,3-<i>d</i>]-pyrimidinium salts
作者:Hiroshi Maruoka、Fumi Okabe、Kenji Yamagata
DOI:10.1002/jhet.5570450543
日期:2008.9
the preparation of N-methyl-4-(methylthio)thieno[2,3-d]pyrimidinium salts 6a,b and 13a,b are described. Treatment of 6a,b and/or 13a,b with active methylene compounds such as malononitrile and ethyl cyanoacetate in the presence of sodium methoxide caused nucleophilic addition followed by elimination of methanethiol, giving the corresponding N-methyl-4-ylidenethieno[2,3-d]-pyrimidines 7a,b, 8a,b, 14a
描述了两种制备N-甲基-4-(甲硫基)噻吩并[2,3- d ]嘧啶鎓盐6a,b和13a,b的方法。在甲醇钠存在下,用活性亚甲基化合物(如丙二腈和氰基乙酸乙酯)处理6a,b和/或13a,b引起亲核加成,然后消除甲硫醇,得到相应的N-甲基-4- yylenethieno [2,3 - d ] -pyrimidines 7A,7B,8A,8B,14A,b和15A,b 。