Synthesis of 2,3,4,6-Tetrasubstituted Pyridines as Precursors to Bicycles and Polycycles
作者:Fathi A. Abu-Shanab
DOI:10.1039/a806439c
日期:——
phenacyl bromide to give 4a,b; also 3a,b reacts with DMFDMA to give 6a,b, and on treatment of 6a with phenacyl bromide affords 8; reaction of 4b with DMFDMA gave 9 while methylation of 3a,b by methyl iodide in ethanolic sodium hydroxide gives 10a,b.
铵 1,1,3-tricyano-2-methylprop-2-enide 1a 和钠 2-amino-1,1,3-tricyanoprop-2-enide 1b 在无水乙醇中用 H2S 处理得到 3,4,6-三取代的吡啶-2(1H)-硫酮3a,b;它们的结构通过与苯甲酰溴反应得到4a,b而得到证实;3a,b 也与 DMFDMA 反应得到 6a,b,用苯甲酰溴处理 6a 得到 8;4b 与 DMFDMA 反应得到 9,而 3a,b 在乙醇氢氧化钠中被甲基碘甲基化得到 10a,b。