1,2-Asymmetric induction in a new tandem of (3,3)-sigmatropic rearrangement of allylic thiocyanates and intramolecular amine addition to NCS group
作者:Miroslava Martinková、Jozef Gonda
DOI:10.1016/s0040-4039(96)02429-x
日期:1997.2
A new synthetic route to diastetereomerically pure 1,3-imidazolidin-2-thiones via a tandem of (3,3)-sigmatropic rearrangement of chiral thiocyanates followed by stereoselective intramolecular amine addition to arising isothiocyanates is reported. The semiempirical AM1 calculations demonstrate that the observed diastereoselectivity is entirely consistent with the energy difference between diastereomeric
一种新的合成路线,以diastetereomerically纯1,3-咪唑烷-2-硫酮通过手性硫氰酸盐的(3,3)-sigmatropic重排的串联随后通过立体选择性分子内胺除了产生异硫氰酸酯报道。半经验AM1计算表明,观察到的非对映选择性与杂环化步骤的非对映过渡态之间的能量差完全一致。