The C-6 methyl group of methyl (4R, SS)-2, 4, 6-trimethyl-5-(p-tolylsulfinyl)-1, 4-dihydropyridine-3-carboxylate (2) was found to be regioselectively lithiated by participation of the neighboring sulfinyl group, giving rise to the 6-modified Hantzsch-type compounds by treatment with n-butyllihium and the electrophiles.
研究发现,(4R, SS)-2, 4, 6-三甲基-5-(
对甲苯基亚磺酰基)-1, 4-
二氢吡啶-3-
羧酸甲酯(2)的 C-6 甲基在邻近亚磺酰基的参与下发生了区域选择性光化,从而在
正丁基锂和亲电物的处理下生成了 6 改性的汉茨奇型化合物。