Preparation of lithium 5-lithiomethy-3-methylpyrazole-1-carboxylate and its reaction with α-oxoketene dithioacetals: A new general method for substituted and annelated pyrazolo[1,5-a]pyridines
作者:Kaushal Kishore、K.R Reddy、J.R Suresh、H Ila、H Junjappa
DOI:10.1016/s0040-4020(99)00380-4
日期:1999.6
metallated at the C-5 methyl carbon atom to form lithium 5-lithiomethyl-3-methylpyrazole-1-carboxylate 3 which on reaction with α-oxoketene dithioacetals 4a-d, 12a-c and 15a-b yields substituted and annelated pyrazolo[1,5-a]pyridines 7a-d, 13a-c and 16a-b.
5-甲基吡唑衍生物1在C-5甲基碳原子上金属化形成5-锂硫基甲基-3-甲基吡唑-1-羧酸锂3,与α-氧杂环丁烯二硫缩醛4a-d,12a-c和15a-b反应生成取代并退火的吡唑并[1,5 - a ]吡啶7a-d,13a-c和16a-b。