Zirconocene-catalyzed kinetic resolution of dihydrofurans
摘要:
Zisconocene-catalyzed kinetic resolution of dihydrofurans may be effected in the presence of 10 mol% non-racemic (EBTHI)ZrCl2. Transformations reported herein proceed efficiently to afford two constitutionally distinct and readily separable products with excellent levels of diastereo- and enantioselectivity. Preparation and resolution of the substrate furans may be carried out in a single pot.
Conversion of (Z)-1,4-dihydroxyalk-2-enes into 2,5-dihydrofurans and of alkane-1,4-diols into tetrahydrofurans via acid-catalysed cyclisation of the monoisoureas formed by their copper(i)-mediated reactions with dicyclohexylcarbodiimideElectronic supplementary information (ESI) available. Experimental data for compounds 14a–f, 15a–f, 7a–f, 22a–g, 21a–e and 2b–e: See http://www.rsc.org/suppdata/p1/b2/b203389p/