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
直接氨基酸催化的化学和对映选择性工艺,用于高度取代的2-烷基-环戊烷-1,3-二酮,2-烷基-3-甲氧基-环戊-2-烯酮和Hajos-Parrish(HP酮类似物是通过还原烷基化化学方法得到的。通过有机催化还原烷基化策略,我们首次开发了通过醛/酮和Hantzsch酯的环戊烷1,3-二酮单步烷基化。氨基酸催化的级联烯化-加氢和环戊烷-1,3-二酮,醛/酮,Hantzsch酯和甲基乙烯基酮的级联罗宾逊环化的直接组合提供了高官能度的HP酮类似物,具有良好的高收率,并且具有优异的对映选择性。