Application of Organolithium and Related Reagents in Synthesis. Part 11<sup>1</sup>. Metallation of 2-Methyl- and 4-Methylnicotinic Acids. A Useful Method for Preparation of AZA-Isocoumarins
作者:J. Epsztajn、M. W. Płotka、J. Ścianowski
DOI:10.1080/00397919208019305
日期:1992.5
Abstract The metallation (LDA/THF) of 2-methyl- and 4-methylnicotinic acids (1) and (2), and the subsequent reaction of the lithiated species (3) and (4) with carbonyl electrophiles as a synthetic route of 5-aza- and 7-aza-isocoumarins (7), (8), (9) and (10), is described. The isocoumarins (9) and (10) appeared to be readily transformable into the corresponding naphthyridines (11) and (12).
摘要 2-甲基-和 4-甲基烟酸 (1) 和 (2) 的金属化 (LDA/THF),以及锂化物质 (3) 和 (4) 与羰基亲电试剂的后续反应,作为 5描述了-氮杂-和7-氮杂-异香豆素(7)、(8)、(9)和(10)。异香豆素 (9) 和 (10) 似乎很容易转化为相应的萘啶 (11) 和 (12)。