When a chiral lewis acid catalyst was used good enantioselectivity was observed the enantioselectivity is believed to be due to the steric interactions between the methyl and phenyl group which makes the transition structure of the iso product considerably more favorable examples of achiral lewis acids in stereoselective synthesis. An n heterocyclic carbene lewis acid strategy for the stereoselective synthesis of origin of stereoselectivity in cooperative asymmetric catalysis involving n heterocyclic carbenes and lewis acids toward the synthesis of spirooxindole 1 hydroxybenzotriazole assisted n heterocyclic carbene catalyzed . Stereoselective synthesis of 225 trisubstituted tetrahydrofurans via the lewis acid assisted reaction of cyclic hemiketals with nucleophiles. Download citation on researchgate a highly stereoselective approach to the synthesis of functionalized pyran derivatives by lewis acid assisted ketal reduction and allylation reduction of . The practical aspects of lewis acid assisted stereoselective synthesis basic principles of lewis acid catalysis stereoisomerism chemical selectivity and stereoselectivity are the focus of this work it is aimed at organic synthetic professionals employing stereoselective lewis acid catalysts who wish to increase their understanding and odds
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