Asymmetric Bromoaminocyclization and Desymmetrization of Cyclohexa-1,4-dienes through Anion Phase-Transfer Catalysis
作者:Hai-Jiao Long、Yin-Long Li、Bing-Qian Zhang、Wen-Ying Xiao、Xiao-Ying Zhang、Ling He、Jun Deng
DOI:10.1021/acs.orglett.1c02817
日期:2021.11.5
The catalytic enantioselectivedesymmetrizing bromoaminocyclization of prochiral cyclohexa-1,4-dienes has been achieved by using chiral anion phase-transfer catalysis, providing a range of enantioenriched cis-3a-arylhydroindoles bearing an all-carbonquaternarystereocenter in good yields (up to 78%) and excellent enantioselectivities (up to 97% ee). Furthermore, the potential application of this methodology
Diastereoselective Hydroformylation of 2,5-Cyclohexadienyl-1-carbinols with Catalytic Amounts of a Reversibly Bound Directing Group
作者:Ippei Usui、Kenichi Nomura、Bernhard Breit
DOI:10.1021/ol1028546
日期:2011.2.18
A phosphinite plays a role as a reversiblybounddirectinggroup for the regio- and diastereoselectivehydroformylation of 2,5-cyclohexadienyl-1-carbinols. Of the two alkene functions only one was functionalized through hydroformylation to form a synthetically attractive quaternary carbon center leaving the second alkene function for potential further functionalization.
Dehydrative Coupling of 1,1-Diarylalkenes and Cyclohexa-2,5-diene-1-carbaldehyde Derivatives Induced by a B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Initiated [1,2]-Alkyl Migration