One-pot four-component synthesis of polysubstituted thiazoles via cascade Ugi/Wittig cyclization starting from odorless Isocyano(triphenylphosphoranylidene)-acetates
作者:Zhi-Rong Guan、Zi-Ming Liu、Qin Wan、Ming-Wu Ding
DOI:10.1016/j.tet.2020.131101
日期:2020.4
A new one-pot four-component preparation of polysubstituted thiazoles by a cascade Ugi/Wittig cyclization has been developed. The four-component reactions of the odorless isocyano(triphenylphosphoranylidene)acetates 1, aldehydes 2, amines 3 and thiocarboxylic acids 4 produced 2,4,5-trisubstituted thiazoles 5 in moderate to good yields in the presence of triethylamine. The two-component reactions between
通过级联的Ugi / Wittig环化反应,开发了一种新的单锅四组分多取代噻唑制剂。在三乙胺的存在下,无味的异氰基(三苯基正膦亚基)乙酸酯1,醛2,胺3和硫代羧酸4的四组分反应以中等至良好的产率产生了2,4,5-三取代的噻唑5。异(三苯基亚正膦)之间的双组分反应乙酸盐1个硫代羧酸4在三乙胺的存在提供了相应的4,5 -二取代的噻唑6以良好的收率,以及。