A Novel Solution- and Solid-Phase Approach to 2,4,5-tri- and 2,4,5,6-tetrasubstituted pyrimidines and their conversion into condensed heterocycles
作者:Thierry Masquelin、Daniel Sprenger、Roman Baer、Fernand Gerber、Yves Mercadal
DOI:10.1002/hlca.19980810315
日期:——
and [bis(methylthio)methylidene]malononitrile (6), respectively, was first established in solution (Scheme 1) and successfully transferred onto solid support by using the polymer-bound thiouronium salt 11 (Scheme 3). Further investigations were directed toward a multidirectional cleavage procedure of the 2-(alkylsulfinyl) intermediates, obtained from the 2-(alkylthio)pyrimidines 7a (Scheme 2) or 12
通过缩合3型硫脲盐与(乙氧基亚甲基)丙二腈的缩合反应合成2,4,5-三-和2,4,5,6-四取代的嘧啶5a-d和7a,e,f,g (4首先在溶液中(流程1)分别建立)和[双(甲硫基)亚甲基]丙二腈(6),然后使用与聚合物结合的硫代铀盐11(流程3)成功地将其转移到固体载体上。进一步的研究针对由2-(烷硫基)嘧啶7a(方案2)获得的2-(烷基亚磺酰基)中间体的多方向裂解程序)或12和14(方案3和4),用不同的亲核试剂形成高度取代的嘧啶。另外,稠合杂环衍生物22A - H,24A-C ,和26A-E在产生良好至优秀通过缩合收率7a中,E,H与多功能的异氰酸酯和异硫氰酸酯,与随后烷基化(方案5) 。