作者:Calum Macleod、Carolyn A. Austin、Dieter W. Hamprecht、Richard C. Hartley
DOI:10.1016/j.tetlet.2004.09.170
日期:2004.11
homobenzylic thioacetals are prepared from ortho-nitrobenzaldehydes via homologation using an alpha-methoxy Wittig reagent. Titanium reagents are generated from the 1,3-dithianes using a low valent titanium reagent and are then used to alkylidenate resin-bound esters. An N-silylated Boc group protects the ortho-amino functionality. Traceless SPS of quinolines is completed by treating the resulting
使用α-甲氧基Wittig试剂由邻硝基苯甲醛经同源制备邻氨基氨基苄基硫缩醛。钛试剂是使用低价钛试剂从1,3-二噻吩生成的,然后用于烷基化树脂结合的酯。N-甲硅烷基化的Boc基团保护邻氨基官能团。通过用TFA处理所得的树脂结合的烯醇醚,然后用二氧化锰氧化,可以得到高纯度的2-取代的喹啉,而无需色谱,从而完成了喹啉的无痕SPS。