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