Synthesis of chiral 1,4-dihydropyridines by diastereoface-selective asymmetric addition to nicotinic amides
作者:Shinji Yamada、Mayumi Ichikawa
DOI:10.1016/s0040-4039(99)00683-8
日期:1999.5
Diastereoface-selective asymmetric addition of organometallic reagents to pyridinium salts of 1 and 2 was performed to give chiral1,4-dihydropyridines in good regio- and stereoselectivities. The absolute configuration of the newly-produced chiral center was determined by X-ray analysis after derivation to menthyloxycarbamate 10. Neighboring group participation of the thiocarbonyl group to the pyridinium