Organocatalytic One-Pot Asymmetric Synthesis of 4<i>H</i>,5<i>H</i>-Pyrano[2,3-<i>c</i>]pyrazoles
作者:Dieter Enders、André Grossmann、Bianca Gieraths、Muharrem Düzdemir、Carina Merkens
DOI:10.1021/ol301983f
日期:2012.8.17
An efficient one pot asymmetric synthesis of tetrahydropyrano[2,3-c]pyrazoles has been developed. This class of biologically active heterocycles can be obtained via a secondary amine catalyzed asymmetric Michael/Wittig/oxa-Michael reaction sequence. Remarkably, the title compounds were accessible in good to very good yields and very good to excellent enantioselectivities after a single purification
已经开发出有效的一锅不对称合成四氢吡喃并[2,3- c ]吡唑。这类生物活性杂环可通过仲胺催化的不对称迈克尔/维蒂希/氧杂-迈克尔反应序列获得。值得注意的是,在单个纯化步骤之后,标题化合物以良好至非常好的收率和非常良好至优异的对映选择性被获得。