Solid-Phase Parallel Synthesis of 5-Amino- and 5-Amido-1,2,4-thiadiazole Derivatives via Cyclization Reactions of a Carboxamidine Thiourea Linker
作者:Young-Dae Gong、In Ryu、Joo Park、Hyea Han
DOI:10.1055/s-0028-1087961
日期:2009.4
parallel synthesis of 5-amino- and 5-amido-1,2,4-thiadiazoles. The sequence developed for this purpose is based on cyclization reactions of resin-bound carboxamidine thioureas promoted by p-toluene-sulfonyl chloride. The resin-bound carboxamidine thioureas, produced by addition of arylcarboxamidines to a isothiocyanate terminated resin, serve as key intermediates that undergo cyclizations to generate
描述了 5-氨基-和 5-氨基-1,2,4-噻二唑固相平行合成的一般方法。为此目的开发的序列是基于对甲苯磺酰氯促进的树脂结合的甲脒硫脲的环化反应。树脂结合的甲脒硫脲是通过将芳基甲脒加成到异硫氰酸酯封端的树脂中产生的,作为关键中间体,经过环化生成 5-氨基-1,2,4-噻二唑树脂。5-氨基-1,2,4-噻二唑树脂的N-烷基化或N-酰化反应产生所需的各种官能化的1,2,4-噻二唑树脂。最后,然后通过在 CH 2 Cl 2 中在 TFA 下裂解相应的 1,2,4-噻二唑树脂,以良好的产率和纯度生成 5-氨基-和 5-氨基-1,2,4-噻二唑。