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.
控制直链烷烃 C 2 H 2n+2的 C-H 键功能化中的区域选择性通过卡宾从重氮化合物转移仅限于使用铑基催化剂,它控制使用供体-受体重氮试剂的反应结果。与该催化剂控制策略不同,我们提出了一种替代方法,其中使用含有三吡唑基硼酸盐配体的适当银配合物作为催化剂,其空间和电子性质差异很大,区域选择主要由重氮试剂控制,这导致线性烷烃的一级或二级位点的功能化(缺少任何活化或导向基团)。供体-受体芳基重氮乙酸酯专门提供己烷或戊烷二级位点的功能化,而受体重氮乙酸乙酯导致前所未有的初级功能化水平。
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.
Carbene-Controlled Regioselective Functionalization of Linear Alkanes under Silver Catalysis
作者:María Álvarez、Francisco Molina、Pedro J. Pérez
DOI:10.1021/jacs.2c11707
日期:2022.12.28
linear alkanes C2H2n+2 via carbenetransferfrom diazo compounds is restricted to the use of rhodium-based catalysts, which govern the reactionoutcome employing donor–acceptor diazo reagents. At variance with that catalyst-controlled strategy, we present an alternative approach in which employing the appropriate silver complexes containing trispyrazolylborate ligands as catalysts with large differences
控制直链烷烃 C 2 H 2n+2的 C-H 键功能化中的区域选择性通过卡宾从重氮化合物转移仅限于使用铑基催化剂,它控制使用供体-受体重氮试剂的反应结果。与该催化剂控制策略不同,我们提出了一种替代方法,其中使用含有三吡唑基硼酸盐配体的适当银配合物作为催化剂,其空间和电子性质差异很大,区域选择主要由重氮试剂控制,这导致线性烷烃的一级或二级位点的功能化(缺少任何活化或导向基团)。供体-受体芳基重氮乙酸酯专门提供己烷或戊烷二级位点的功能化,而受体重氮乙酸乙酯导致前所未有的初级功能化水平。