已经设计了一锅顺序的对羟基苄基化/氧化脱芳香化/螺环化以有效地构建含有螺环-环己二酮的四氢呋喃。这通过在反应进行p的1,3-二酮与-hydroxybenzylation p羟基苄基醇通过醌甲基化物的形成,随后氧化脱芳构化/ spiroannulation与合适的醇。螺[4.5]环己二酮与吲哚的弗里德尔-克来夫茨烷基化反应提供了一系列高度非对映选择性的C-3烷基化螺环和环庚[ b ]吲哚,具体取决于稠合环酮的环大小。
Direct amino acid-catalyzed cascade biomimetic reductive alkylations: application to the asymmetric synthesis of Hajos–Parrish ketone analogues
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1039/b807999d
日期:——
and enantioselective process for the double cascade synthesis of highly substituted 2-alkyl-cyclopentane-1,3-diones, 2-alkyl-3-methoxy-cyclopent-2-enones and Hajos-Parrish (H-P) ketone analogs is presented via reductive alkylation chemistry. For the first time, we have developed a single-step alkylation of cyclopentane-1,3-dione with aldehydes/ketones and a Hantzsch ester through an organocatalytic reductive