Facile Synthesis of 2-Alkylthio-5,6,7,8-tetrahydrobenzothieno[2,3-<i>d</i>]pyrimidin-4(3<i>H</i>)-ones
作者:Xiao-Hua Zeng、Min Liu、Ming-Wu Ding、Hong-Wu He
DOI:10.1080/00397910903097294
日期:2010.4.26
aza-Wittig reaction of iminophosphorane 1 with CS2, reacted with amine to give 2-thioxo-2,3,5,6,7,8-hexahydrobenzothieno[2,3-d]pyrimidin-4(1H)-ones 4 in the presence of sodium ethoxide. S-Alkylation of 4 produced 2-alkylthio-5,6,7,8-tetrahydrobenzothieno[2,3-d]pyrimidin-4(3H)-ones 5 in good yields.
异硫氰酸酯 2,由亚氨基正膦 1 与 CS2 的氮杂-Wittig 反应获得,与胺反应得到 2-thioxo-2,3,5,6,7,8-六氢苯并噻吩并[2,3-d]嘧啶-4(1H) -ones 4 在乙醇钠的存在下。4 的 S-烷基化以良好的产率产生 2-烷硫基-5,6,7,8-四氢苯并噻吩并[2,3-d]嘧啶-4(3H)-ones 5。