We have developed an efficient chemical resolution of racemic hydroxy substituted dithia-aza[4]helicenes (DTA[4]H) 1(OH) using enantiopure acids as resolving agents. The better diastereomeric separation was achieved on esters prepared with (1S)-(−)-camphanic acid. Subsequent simple manipulations produced highly optically pure (≥ 99% enantiomeric excess) (P) and (M)-1(OH) in good yields. The role of
我们使用对映体纯酸作为拆分剂,开发了一种高效的外消旋羟基取代的二
硫杂氮杂[4]螺旋烯 (DTA[4]H) 1(OH)
化学拆分方法。在用 (1S)-(-)-
樟脑酸制备的酯上实现了更好的非对映异构体分离。随后的简单操作以良好的收率产生了高光学纯度(≥ 99% 对映体过量)(P)和(M)-1(OH)。讨论了手性助剂插入位置(开普区与海湾区)的作用以及用于成功拆分的对映体纯酸的结构。