A soluble, chiral, rhodium-containing catalyst which permits the catalytic reduction of prochiral 3-acyl-1-(2-alkoxyethyl)-4-phenyl-2-imidazolinones to chiral 3-acylimidazolidinones with a substantial excess of the desired S optical isomer. The 3-acylimidazolidinones may in turn be substantially converted to levamisole, and S isomer of tetramisole. The resolution of tetramisole to remove the R isomer is thus avoided.
一种可溶性手性的含
铑催化剂,可以催化还原具有前手性的3-酰基-1-(2-烷氧基乙基)-
4-苯基-2-咪唑啉酮,生成手性的3-酰基
咪唑烷酮,且所需的S-光学异构体过量较大。进一步将3-酰基
咪唑烷酮转化为左旋美
硫磷和四氢美
硫磷的S异构体。因此,避免了对四氢美
硫磷进行拆分以去除R异构体的过程。