Ethyl-(r)-(4-methylphenylsulfinyl)-n-methoxy acetimidate a useful chiral acetate equivalent in aldol type condensations
作者:Anna Bernardi、Lino Colombo Cesare Gennari、Laura Prati
DOI:10.1016/s0040-4020(01)88806-2
日期:1984.1
lithium amides and reacted with (-)-(S)-menthyl p-toluenesulfinate to afford, in excellent yield, (R) - (4-methylphenylsulfinyl)-ethyl-N-methoxy acetimidate (2). Compound (2) was tested in aldol-type condensations with various aldehydes, and the adducts, after desulfurization, were converted into optically active β-hydroxyesters with good ⩾80%) e.e. The stereochemical outcome of the reaction of benzaldehyde
将N-甲氧基乙亚胺酸乙酯通过酰胺化锂金属化,并与(-)-(S)-薄荷基对甲苯磺酸盐反应,以优异的收率得到(R)-(4-甲基苯基亚磺酰基)-乙基-N-甲氧基乙亚氨酸盐(2) 。化合物(2)在与各种醛的醛醇缩合型中进行了测试,加合物在脱硫后被转化为光学活性β-羟基酯,good80%良好。ee苯甲醛反应的立体化学结果显着通过将烯醇盐的抗衡离子从锂更改为锆或从动力学控制更改为热力学控制,可以实现上述目的。