Regie-Control of Formal [3 + 2] Cycloadditions of 5-Alkoxyoxazoles with Diethyl Oxomalonate
作者:Hiroyuki Suga、Xiaolan Shi、Toshikazu Ibata
DOI:10.1246/cl.1994.1673
日期:1994.9
Tin(IV) chloride-catalyzed formal [3 + 2] cycloadditions of 5-alkoxy-2-(p-methoxyphenyl)- or 2-phenyloxazoles with diethyl oxomalonate gave 2-oxazoline-4,5,5-tricarboxylates in high regioselectivity. 4-Substituted 5-alkoxy-2-methyloxazoles showed a trend to shift the regioselectivity to offer more 3-oxazoline-2,5,5-tricarboxylates in terms of regioselectivity than 2-oxazolines.
氯化锡 (IV) 催化的 5-烷氧基-2-(对甲氧基苯基)-或 2-苯基恶唑与氧代丙二酸二乙酯的缩甲醛 [3 + 2] 环加成反应以高区域选择性得到 2-恶唑啉-4,5,5-三羧酸酯。4-取代的 5-烷氧基-2-甲基恶唑显示出改变区域选择性的趋势,在区域选择性方面提供比 2-恶唑啉更多的 3-恶唑啉-2,5,5-三羧酸盐。