Simple Synthesis of Enantiomerically Pure, Protected cis-Bicyclo[4.4.0]decane-1-carboxaldehyde Derivatives from Cyclohexanones by the 3-Arenesulfonyloxazolidine Route
Synthesis of Highly Functionalized, Enantiomerically and Diastereomerically Pure Cyclohexane Derivates via Michael Addition of Chiral 3-Tosyl-2-(2-oxoalkyl)-1,3-oxazolidines and Methyl Vinyl Ketone
Synthesis of Highly Functionalized, Enantiomerically and Diastereomerically Pure Cyclohexane Derivates via Michael Addition of Chiral 3-Tosyl-2-(2-oxoalkyl)-1,3-oxazolidines and Methyl Vinyl Ketone
2-(2-Oxocycloalkyl)- or 2-phenylacyl-3-tosyl-1,3-oxazolidines 1, 2, 9, and 10 undergo with 3-buten-2-one highly diastereoselective Michael additions under the influence of cesium carbonate to yield 1,5-diketones 8 or 11, respectively. Intramolecular aldolization of diketones 8 yields stereohomogeneous cyclohexanones 13 or 14. Addition of nucleophiles to ketones 14, again, proceeds highly stereoselectively to give diols 17. Overall, under the stereodirecting influence of N-tosyl-2-aminoalkanols, stereohomogeneous protected carbaldehydes are constructed within a few steps from simple achiral precursors.
Simple Synthesis of Enantiomerically Pure, Protected cis-Bicyclo[4.4.0]decane-1-carboxaldehyde Derivatives from Cyclohexanones by the 3-Arenesulfonyloxazolidine Route
作者:Olaf Prien、Dieter Hoppe
DOI:10.1055/s-1996-4170
日期:1996.1
The preparation of several enantiomerically pure, functionalized cis-Bicyclo[4.4.0]decane systems from cyclohexanone by the 3-arenesulfonyloxazolidine route is reported.