diaziridine 2c is rearranged in these conditions with ring-expansion. Complete asymmetric transformation has been found to take place on the formation of the solid phase of diastereomers 2d and 2j, and a closed cycle of diastereomeric transformations has been accomplished. Diaziridine 2g with chiral centres only at the nitrogen atoms has been obtained with the optical purity of 85.5% by resolution via
通过邻
甲苯磺酰
肟1a与
炔丙基胺的反应,甘
氨酸和(S)-α-丙
氨酸的酯,β-乙酰氧基
乙胺和β-二甲基
氨基
乙胺经官能团取代的3,3-双(三
氟甲基)二
氮丙啶2a-g具有已获得。在与更大体积的胺,(S)-苯丙
氨酸Et酯,(R,S)-
α-苯乙胺和
叔丁胺的反应中,1a用作甲
苯磺酸化试剂。重
氮丙啶2e中的酯基很容易被
酒精性碱皂化,而重
氮丙啶2c在这些情况下,通过扩环重新排列。已经发现在非对映异构体2d和2j的固相的形成上发生了完全的不对称转化,并且已经完成了非对映异构转化的封闭循环。通过与d-(+)-
樟脑-3-
羧酸的盐5c拆分,获得了仅在氮原子上具有手性中心的二
氮丙啶2g,其光学纯度为85.5%。(+)- 2g及其季盐(+)- 2h的绝对构型已从CD光谱中确定。旋光(-)- 2小时在1–10-
樟脑磺酰基
肟1b的基础上,还通过不对称合成获得了盐(光学纯度为2.0%)。根据2g,h消旋和2d,e,i,j,k