<i>N</i>,<i>N</i>-Acetals as <i>N</i>-Acyliminium Ion Precursors: Synthesis and Absolute Stereochemistry of Epiquinamide
作者:Marloes A. Wijdeven、Roel Wijtmans、Rutger J. F. van den Berg、Wim Noorduin、Hans E. Schoemaker、Theo Sonke、Floris L. van Delft、Richard H. Blaauw、Richard W. Fitch、Thomas F. Spande、John W. Daly、Floris P. J. T. Rutjes
DOI:10.1021/ol801490m
日期:2008.9.18
A stereoselective synthesis of (+)-epiquinamide is presented in combination with determination of the absolute configuration of the natural product. Key steps in the sequence involved chemoenzymatic formation of an enantiomerically pure cyanohydrin, reductive cyclization to the corresponding cyclic N,N-acetal, and subsequent conversion into a suitable N-acyliminium ion precursor to enable construction
结合确定天然产物的绝对构型,提出了(+)-表喹酰胺的立体选择性合成。该序列中的关键步骤涉及对映体纯的氰醇的化学酶促形成,还原环化为相应的环状N,N-乙缩醛以及随后转化为合适的N-酰基亚胺离子前体以构建第二个环。