Facile Synthesis of <i>cis</i>-2-Alkyl-3-trialkylsilyloxycycloalkanones via the Non-Aldol Aldol Rearrangement of 2,3-Epoxycycloalkanols
作者:Michael E. Jung、Damian A. Allen
DOI:10.1021/ol800423m
日期:2008.5.1
3-epoxycycloalkanols A, prepared by epoxidation of the cyclicallylicalcohol and then silylation, afforded good yields ( approximately 70-75%) of the cis-2-alkyl-3-silyloxycycloalkanones B, presumably via the intermediates C and D, even with quite large alpha-substituents, e.g., tert-butyl. Finally, it has been shown that the stereochemistry of the epoxy alcohol is crucial as one would expect from the mechanism
Stereo- and regioselectivity in the P450-catalyzed oxidative tandem difunctionalization of 1-methylcyclohexene
作者:Gheorghe-Doru Roiban、Rubén Agudo、Manfred T. Reetz
DOI:10.1016/j.tet.2013.04.132
日期:2013.7
non-functionalized molecules using biocatalysis based on P450 monooxygenases is known to be difficult due to the expected poor regio- and stereoselectivity, but in this study it was nevertheless attempted. 1-Methylcyclohexene was subjected to oxygen-mediated biocatalytic oxidation using P450-BM3 as the catalyst. Both oxidative hydroxylation and epoxidation were observed, in some cases leading to hydroxy epoxides with