Regioselective Synthesis of 3-Carbo-5-phosphonylpyrazoles through a One-Pot Claisen-Schmidt/1,3-Dipolar Cycloaddition/Oxidation Sequence
作者:Anthony R. Martin、Kishor Mohanan、Loic Toupet、Jean-Jacques Vasseur、Michael Smietana
DOI:10.1002/ejoc.201100167
日期:2011.6
A one-pot reaction involving an aldehyde, a methyl ketone, and the Bestmann-Ohira reagent has been developed for the synthesis of variously substituted 3-carbo-5-phosphonylpyrazoles. Our synthetic methodology features a domino Claisen- Schmidt/1,3-dipolar cycloaddition/oxidation sequence,which leads to the target compounds in excellent yields. We further demonstrated that this unprecedented sequence
一种涉及醛、甲基酮和 Bestmann-Ohira 试剂的一锅反应已被开发用于合成各种取代的 3-carbo-5-phosphonylpyrazoles。我们的合成方法采用多米诺 Claisen-Schmidt/1,3-偶极环加成/氧化序列,以优异的收率生成目标化合物。我们进一步证明,这种前所未有的序列也可以与铜催化的叠氮化物-炔烃环加成在一锅四步级联过程中结合,产生五个新键和两个杂环。