While the iron is hot: The first general and efficient iron‐catalyzed reduction of secondary and tertiary amides into amines using polymethylhydrosiloxane (PMHS) has been developed (see scheme).
An expeditious and practical method for the reduction of amides to amines is reported. The method consists of activation of amides with TMSCl followed by reduction with LiAlH4. Various amides/lactams including hindered amides and secondary amides gave the corresponding amines in good to excellent yields. This novel protocol has a wide substrate scope and shows good functional group tolerance with high
Development and Mechanistic Investigation of a Highly Efficient Iridium(V) Silyl Complex for the Reduction of Tertiary Amides to Amines
作者:Sehoon Park、Maurice Brookhart
DOI:10.1021/ja209567m
日期:2012.1.11
quantitatively reduced to tertiary amines under mild conditions with low catalyst loading. A detailed mechanistic study has been carried out and intermediates identified. In brief, (POCOP)IrH(3)(SiEt(2)H) reduces the amide to the hemiaminal silyl ether that, in the presence of a trialkylammonium salt, is ionized to the iminium ion, which is then reduced to the tertiary amine by Et(2)SiH(2). Good functional