Regioselective synthesis of 4-(2-oxoalkyl)pyridines via 1,4-dihydro-pyridine derivatives using silyl enol ethers and pyridinium salts
作者:Kin-ya Akiba、Yoshihiro Nishihara、Makoto Wada
DOI:10.1016/s0040-4039(00)88414-2
日期:——
– 87% yields. When 2, 2, 2-trichloroethyl chloroformate was employed, yields of the corresponding 1,4-dihydropyridines (0 were higher (80 – 100% yields). and were oxidized by oxygen or AgNO3 to give 4-(2-oxoalkyl)pyridines ( : 30 –65%).
三甲基甲硅烷基烯醇醚()与1-乙氧基羰基吡啶鎓氯化物()在4位反应,具有较高的区域选择性,从而得到1-乙氧基羰基-4-(2-氧代烷基)-1,4-二氢吡啶(收率42 – 87%。当2, 2,2-三氯乙酯被使用时,相应的1,4-二氢吡啶的产率(0较高(80 - 100%的产率)。并且通过氧被氧化或硝酸银3,得到4-(2-氧代)吡啶(: 30 –65%)。