[EN] METHOD FOR SELECTIVE REDUCTION OF AROMATIC COMPOUNDS<br/>[FR] PROCEDE DE REDUCTION SELECTIVE DE COMPOSES AROMATIQUES
申请人:MALLINCKRODT INC
公开号:WO2005068403A3
公开(公告)日:2005-09-01
Method for selective reduction of aromatic compounds
申请人:Wang Xianqi Peter
公开号:US20070112232A1
公开(公告)日:2007-05-17
A method for the selective reduction of an aromatic compound. The present invention provides a method for pre-venting the reduction of at least one halogen substituted aromatic ring of an aromatic compound, while allowing the reduction of at least one functional group on the aromatic compound. In the present invention at least one hydroxyl group is placed on the at least one halogen substituted aromatic ring to be protected from reduction. The aromatic compound is then reacted with at least one alkali metal in at least one nitrogen containing base and at least one alcohol at a ratio of the alcohol to the nitrogen containing base at which the aromatic ring with the hydroxyl group is protected from reduction, while the desired functional group is reduced.
US7312368B2
申请人:——
公开号:US7312368B2
公开(公告)日:2007-12-25
Enantioselective Synthesis of (−)-Dihydrocodeinone: A Short Formal Synthesis of (−)-Morphine<sup>1</sup><sup>,</sup>
作者:Kathlyn A. Parker、Demosthenes Fokas
DOI:10.1021/jo0513008
日期:2006.1.1
applied in an asymmetric synthesis of (−)-dihydrocodeinone. A chiral cyclohexenol (R-32), from the CBS reduction of the enone, is the source of chirality. The first key step, tandem closure in which stereochemistry is controlled by geometric constraints, (−)-15b → (+)-16, was followed by an unprecedented reductive hydroamination, completing the synthesis of (−)-dihydroisocodeine ((−)-17) in 13 steps from