Pyrimidine Derivatives; 1. The Highly Regioselective 4-Thionation of Pyrimidine-2,4(1<i>H</i>,3<i>H</i>)-dione Derivatives with Lawesson Reagent
作者:Kimiyoshi Kaneko、Hajime Katayama、Toshio Wakabayashi、Tadahiro Kumonaka
DOI:10.1055/s-1988-27499
日期:——
Utilizing 2,4-bis(4-methoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetane (Lawesson reagent), the 4-oxo group of pyrimidine bases such as 5-fluorouracil, uracil, and thymine were selectively converted into the corresponding 4-thioxo analogous. 2-Thiouracil was similarly transformed into 2,4-dithiouracil, but 4-thiouracil remains almost intact.
利用2,4-bis(4-methoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetane(Lawesson试剂),选择性地将5-氟尿嘧啶、尿嘧啶和胸腺嘧啶等嘧啶碱基的4-氧基转化为相应的4-硫代类似物。2-硫尿嘧啶也被转化为2,4-二硫尿嘧啶,但4-硫尿嘧啶几乎保持不变。