Ready salted proline: The combination of proline and an achiral triazabicyclodecene‐derived guanidinium salt permits, for the first time, the direct aldol reaction of chloroacetone and aromatic aldehydes (see scheme). The resulting chlorohydrins are formed with high regio‐, diastereo‐ and enantioselectivity. This procedure is experimentally simple and green, working without solvent, in test tubes placed
现成的脯
氨酸盐:脯
氨酸与非手性三
氮杂双环癸烯衍生的
胍盐的组合,首次允许
氯丙酮与芳族醛的直接羟醛反应(参见方案)。生成的
氯醇具有很高的区域,非对映和对映选择性。此过程在实验上简单,绿色,无需溶剂即可在置于标准实验室冰箱内的试管中进行操作,而无需搅拌或机械搅拌。