Nucleophilic Addition to 3-Substituted Pyridinium Salts: Expedient Syntheses of (−)-L-733,061 and (−)-CP-99,994
作者:Alexandre Lemire、Michel Grenon、Mehrnaz Pourashraf、André B. Charette
DOI:10.1021/ol048624n
日期:2004.9.1
[reaction: see text] The addition of nucleophiles to 3-substituted pyridinium salts prepared from N-methylbenzamide and various pyridines has been investigated. Good to excellent regioselectivities favoring the 2,3-disubstituted 1,2-dihydropyridines were observed. The resulting 1,2-dihydropyridines led to the corresponding 2,3-disubstituted pyridines upon treatment with Mn(OAc)3/NaIO4. This methodology
[反应:见正文]已经研究了将亲核试剂加到由N-甲基苯甲酰胺和各种吡啶制得的3-取代的吡啶鎓盐中。观察到良好的至优异的区域选择性,有利于2,3-二取代的1,2-二氢吡啶。在用Mn(OAc)3 / NaIO 4处理时,所得的1,2-二氢吡啶产生相应的2,3-二取代的吡啶。该方法也成功地应用于(-)-L-733,061和(-)-CP-99,994的对映选择性合成,这是一类新型的高效非肽P物质拮抗剂。