Solid-Phase Synthesis of 1,3,7,8-Tetrasubstituted Xanthine Derivatives on Traceless Solid Support
作者:Doohyun Lee、Seungyeon Lee、Kwang-Hyeon Liu、Jong-Sup Bae、Dong Jae Baek、Taeho Lee
DOI:10.1021/acscombsci.5b00148
日期:2016.1.11
carbamimidothioate, which was prepared from cyanamide, isothiocyanate, and Merrifield resin. After N-alkylation of carbamimidothioate resin with ethyl 2-bromoacetate, an imidazole ring is introduced by Thorpe–Ziegler-type cyclization. The resulting imidazole resin is converted to 1,3,7-trisubstituted xanthine resin using sequential reactions, such as Lewis acid-catalyzed urea formation, pyrimidine ring
已经开发了无痕固相合成1,3,7,8-四取代的黄嘌呤(1,3,7,8-四取代的1 H-嘌呤-2,6(3 H,7 H)-二酮)衍生物。固相合成路线始于固体负载的N'-氰基-N-取代的氨基氨基硫代氨基甲酸酯,其由氰酰胺,异硫氰酸酯和Merrifield树脂制备。后Ñ carbamimidothioate树脂的烷基化用2-溴乙酸乙酯,咪唑环被索普-齐格勒型环化引入的。使用诸如路易斯酸催化的尿素形成,嘧啶环环化和N等连续反应,将所得的咪唑树脂转化为1,3,7-三取代的黄嘌呤树脂。-烷基化。在将硫化物氧化为砜后,用胺或硫醇亲核试剂进行无痕裂解,即可得到所需的1,3,7,8-四取代的黄嘌呤,纯度和收率均很高(八步; 36例)。这种有效的固相合成可以将四个多样性点并入1,3,7,8-四取代的黄嘌呤的制备中。