Highly Enantioselective Hydroformylation of Aryl Alkenes with Diazaphospholane Ligands
作者:Avery L. Watkins、Brian G. Hashiguchi、Clark R. Landis
DOI:10.1021/ol801723a
日期:2008.10.16
Asymmetric, rhodium-catalyzed hydroformylation of terminal and internal aryl alkenes with diazaphospholane ligands is reported. Under partially optimized reaction conditions, high enantioselectivity (>90% ee) and regioselectivities (up to 65:1 alpha:beta) are obtained for most substrates. For terminal alkenes, both enantioselectivity and regioselectivity are proportional to the carbon monoxide partial
Metal-Free Asymmetric Synthesis of Indanes through Chiral Hypervalent Iodine(III)-Mediated Ring Contraction
作者:Anees Ahmad、Luiz F. Silva
DOI:10.1021/acs.joc.5b02803
日期:2016.3.4
The iodine(III)-mediated asymmetric oxidative rearrangement of 1,2-dihydronaphthalenes was investigated to prepare optically active 1-substituted indanes. The chiral hypervalent iodine species is generated in situ from a chiral aryl iodide, prepared in 94% yield in one step. This metal-free protocol was applied to different cyclic alkenes, substituted with oxygen, with nitrogen, or at position 1 with