Facile Chemo-, Regio-, and Diastereoselective Approach to <i>cis</i>-3,5-Disubstituted γ-Butyrolactones and Fused γ-Butyrolactones
作者:Md. Merajuddin Baag、Vedavati G. Puranik、Narshinha P. Argade
DOI:10.1021/jo0619128
日期:2007.2.1
Chemoselective SN2‘ condensation of primary enolates of alkyl methyl ketones 2a−e with dimethyl bromomethylfumarate (1) followed by highly diastereoselective NaBH4 reduction of the ketone function in the formed ketodiesters 3a−e and the regioselective in situ lactonization of the unisolable intermediates 4a−e exclusively furnished the cis-3,5-disubstituted γ-butyrolactones (±)-5a−e in very good yields