Nucleophilic addition to chiral pyridinium salts: stereoselective synthesis of (−)-Na-methylervitsine
作者:M.-Lluı̈sa Bennasar、Ester Zulaica、Yolanda Alonso、Joan Bosch
DOI:10.1016/s0957-4166(02)00866-2
日期:2003.2
Chiral non-racemic 4-substituted 3,5-diacyl-1,4-dihydropyridines 8 are prepared by the regio- and diastereoselective addition of organocopper reagents to chiral pyridinium salt 2, followed by acylation with trichloroacetic anhydride and subsequent haloform reaction. Additionally, (−)-Na-methylervitsine is synthesized by reaction of the enolate derived from 2-acetylindole 9 with pyridinium salt 2, followed
通过将有机铜试剂区域和非对映选择性地添加到手性吡啶鎓盐2中,然后用三氯乙酸酐酰化并随后进行卤仿反应,来制备手性非外消旋的4-取代的3,5-二酰基-1,4-二氢吡啶8。另外,( - ) - ñ一个-methylervitsine是通过从2乙酰基吲哚衍生的烯醇化物的反应,合成9与吡啶鎓盐2,其次是电试剂(ME 2 Ñ + CH 2我- )-诱导的环化反应和随后的阐述16-亚甲基和(20 E)-亚乙基取代基。