An Expedient, Flexible and Convergent Access to Selectively Protected 1,5-Dicarbonyl Compounds. Applications to the Synthesis of 2,6-Disubstituted Pyridines and Thiopyridines
作者:Jean Boivin、Floriane Carpentier、Rafik Jrad
DOI:10.1055/s-2006-926464
日期:2006.5
Intermolecular addition of 2-oxoalkyl radicals generated from the corresponding S-alkyl-O-ethyl dithiocarbonates on vinyl ketals afforded selectively protected 1.5-dicarbonyl compounds in good yields. These key-intermediates can be converted into a plethora of useful substances. Transformations to pyridines and thiopyridines were given as examples.
由相应的 S-烷基-O-乙基二硫代碳酸酯在乙烯基缩酮上产生的 2-氧代烷基自由基的分子间加成以良好的收率提供了选择性保护的 1,5-二羰基化合物。这些关键中间体可以转化为大量有用的物质。作为例子给出了向吡啶和硫代吡啶的转化。