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