Synthesis of thiazole analogues of the immunosuppressive agent (1R,2S,3R)-2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole
作者:George R. Jeoffreys、Alison T. Ung、Stephen G. Pyne、Brian W. Skelton、Allan H. White
DOI:10.1039/a903675j
日期:——
The synthesis of four of the diastereoisomers of 2-acetyl-5-(1,2,3,4-tetrahydroxybutyl)thiazole and two of the diastereoisomers of 2-acetyl-5-(1,2,3,4,5-pentahydroxypentyl)thiazole and 2-acetyl-4-(1,2,3,4,5-pentahydroxypentyl)thiazole are reported. These syntheses involve the condensation of 5- or 4-metallated 2-(1,1-dimethoxyethyl)thiazoles with 2,3-O-isopropylidene-D-erythrono-1,4-lactone or 5-O
2-乙酰基-5-(1,2,3,4-四羟基丁基)噻唑的四种非对映异构体的合成和2-乙酰基-5-(1,2,3,4,5-五羟基戊基的两种非对映异构体的合成报道了噻唑和2-乙酰基-4-(1,2,3,4,5-五羟基戊基)噻唑。这些合成涉及5-或4-金属化的2-(1,1-二甲氧基乙基)噻唑与2,3 - O-异亚丙基-D-赤藓基-1,4-内酯或5- O-(叔丁基二甲基甲硅烷基)的缩合。-2,3- ø异亚丙基d -ribonolactone然后将所得内半缩醛还原开环。一些关键化合物的立体化学和结构已通过单晶X射线结构分析确定。