Improved conditions for the addition of alkoxides to di(ethylene glycol) di- p -tosylate: application to the stereospecific synthesis of the trans -isomers of dicyclohexano-18-crown-6
作者:Vincent J Huber、Mark L Dietz
DOI:10.1016/s0040-4039(01)00331-8
日期:2001.4
Conditions are defined for the efficient preparation of polyethers by direct condensation of ditosylates and alkoxides, and this approach is shown to provide a facile method for the synthesis of the trans-syn-trans (C) and trans-anti-trans (D) isomers of dicyclohexano-18-crown-6 (DCH18C6), one which both provides significantly improved yields and avoids the difficult separations required by certain