Regio- and Stereoselective Ferrier Reaction of O-1,3-Dienyl Acetals Promoted by Organoaluminum Complexes
摘要:
The Ferrier reaction of O-1,3-dienyl acetals promoted by organoaluminum complexes such as methylaluminum bis(2,6-di-tert-butyl-4-methylphenoxide) (MAD) is shown to proceed with a high degree of regio- and stereoselectivity to afford the corresponding alpha-alkenyl-substituted beta-alkoxy aldehydes in good yields. The mechanistic origin of the high regiocontrolling ability of MAD is elucidated. This method, coupled with the easy availability of the requisite substrates, expands the synthetic scope of the Ferrier reaction.
A Facile Method for the Stereoselective Preparation of (1<i>Z</i>,3<i>E</i>)-Dienyl Ethers via 1,4-Elimination of 1,4-Dialkoxy-(2<i>Z</i>)-alkenes with <i>n</i>-Butyllithium
作者:Eiji Tayama、Sayaka Sugai
DOI:10.1055/s-2006-939053
日期:——
Treatment of 1-alkoxy-4-methoxy-(2Z)-alkenes or 1-siloxy-4-methoxy-(2Z)-alkenes with n-butyllithium in diethyl ether is shown to afford the corresponding (1Z,3E)-dienyl, alkyl or silyl ethers, respectively, in high stereoselectivity via a facile 1,4-elimination. The scope and the regio- and stereochemical features of the synthetic method are described.
Regio- and Stereoselective Ferrier Reaction of <i>O</i>-1,3-Dienyl Acetals Promoted by Organoaluminum Complexes
作者:Eiji Tayama、Wataru Isaka
DOI:10.1021/ol062042j
日期:2006.11.1
The Ferrier reaction of O-1,3-dienyl acetals promoted by organoaluminum complexes such as methylaluminum bis(2,6-di-tert-butyl-4-methylphenoxide) (MAD) is shown to proceed with a high degree of regio- and stereoselectivity to afford the corresponding alpha-alkenyl-substituted beta-alkoxy aldehydes in good yields. The mechanistic origin of the high regiocontrolling ability of MAD is elucidated. This method, coupled with the easy availability of the requisite substrates, expands the synthetic scope of the Ferrier reaction.