1-Bis(methoxy)-4-bis(methylthio)-3-buten-2-one: useful three carbon synthon for synthesis of five and six membered heterocycles with masked (or unmasked) aldehyde functionality
作者:Pranab K Mahata、U.K Syam Kumar、V Sriram、H Ila、H Junjappa
DOI:10.1016/s0040-4020(03)00332-6
日期:2003.4
1-Bis(methoxy)-4-bis(methylthio)-3-buten-2-one has been shown to be a useful three carbon synthon for efficient regiospecific synthesis of a variety of five (pyrazole and isoxazole) and six membered (pyrimidines, pyridone and pyridines) heterocycles with masked (or unmasked) aldehyde functionality by cyclocondensation with bifunctional heteronucleophiles such as hydrazine, hydroxylamine, guanidine
1-双(甲氧基)-4-双(甲硫基)-3-丁烯-2-酮已被证明是有效的区域特异性合成多种五(吡唑和异恶唑)和六元(嘧啶)的有用的三碳合成子(吡啶酮和吡啶)杂环具有双(或非双)醛官能团,可通过与双官能异核试剂如肼,羟胺,胍,硫脲,氰基乙酰胺和取代的β-硫代氨基丙烯腈进行环缩合反应。在Simmons-Smith反应条件下,1-双(甲氧基)-4-双(甲硫基)-3-丁烯-2-酮与亚甲基碘和Zn-Cu的反应得到了良好的2-(甲硫基)噻吩-4-醛用噻吩-2-和3-乙腈进行环芳烃化可得到相应的取代苯并噻吩-4-和7-醛。