Expanding the Scope of Primary Amine Catalysis: Stereoselective Synthesis of Indanedione-Fused 2,6-Disubstituted <i>trans-</i>Spirocyclohexanones
作者:G. Madhusudhan Reddy、Chi-Ting Ko、Kai-Hong Hsieh、Chia-Jui Lee、Utpal Das、Wenwei Lin
DOI:10.1021/acs.joc.5b02921
日期:2016.3.18
A cinchona-alkaloid-derived chiral primary-amine-catalyzed enantioselective method for the synthesis of the thermodynamically less stable indanedione-fused 2,6-trans-disubstituted spirocyclohexanones is demonstrated. Both the enantiomeric forms of the trans isomer are obtained in excellent yields and enantioselectivities. Furthermore, one of the enantiopure trans-spiranes bearing an additional α-substitution