作者:Pakamas Tongcharoensirikul、Alirica I. Suarez、Troy Voelker、Charles M. Thompson
DOI:10.1021/jo035707t
日期:2004.4.1
benzaldimine derived from threonine methyl ester and alanine methyl ester were far less diastereoselective, affording 38:62 and 61:39 ratios, respectively. Addition of DMTP to the benzaldimine derived from (R)-α-methylbenzylamine (78:22) and (S)-serine methyl ester (73:27) were intermediate in selectivity. DMTP addition to the imines formed between serine methyl ester and acetaldehyde and isobutyraldehyde
由亚磷酸二甲酯合成了二甲基硫代亚磷酸酯(DMTP),并研究了将DMTP的非对映选择性加成到带有手性辅助基团的苯扎二胺上。色谱分离后,产物α-氨基膦酸酯的产率为17%至75%。将DMTP加到衍生自(S)-苯基甘氨醇的苯甲二胺中可获得最高的非对映选择性(83:17),而将DMTP加到衍生自苏氨酸甲酯和丙氨酸甲酯的苯并二胺中的非对映选择性要低得多,得到38:62和比例分别为61:39。在衍生自(R)-α-甲基苄胺(78:22)和(S)-丝氨酸甲酯(73:27)的选择性中等。DMTP加到丝氨酸甲酯与乙醛和异丁醛之间形成的亚胺上的比例分别为55:45和70:30,非对映选择性大致对应于α-烷基的大小。通过将DMTP添加到(S)-和(R)-苯基甘氨醇苯甲二胺中而形成的新形成的α-立体中心的立体化学通过将产物α-氨基膦硫酸酯转化为膦酰基苯基甘氨酸的已知对映异构体得以证实。