作者:Andreas Tschöp、Andreas Marx、Anakallil R. Sreekanth、Christoph Schneider
DOI:10.1002/ejoc.200601101
日期:2007.5
The scandium-bipyridine-catalyzed ring-opening of meso-epoxides with aliphatic alcohols has been studied. Aromatic epoxides were ring-opened with >90 % ee furnishing valuable 1,2-diol monoethers in typically good yields whereas aliphatic epoxides gave rise to moderate enantioselectivities. The catalyst loading may be lowered to 2–5 mol-% with only marginal effects on yield and enantioselectivity. A
Isothiourea-Catalysed Sequential Kinetic Resolution of Acyclic (±)-1,2-Diols
作者:Siegfried Harrer、Mark D. Greenhalgh、Rifahath M. Neyyappadath、Andrew D. Smith
DOI:10.1055/s-0037-1610721
日期:2019.8
The isothiourea-catalysed acylative kineticresolution of a range of acyclic (±)-1,2-diols using 1 mol% of catalyst under operationally simple conditions is reported. Significantly, the bifunctional nature of (±)-1,2-diols was exploited in a sequential double kineticresolution, in which both kineticresolutions operate synergistically to provide access to highly enantioenriched products. The principles