Palladium(II)-Catalyzed Highly Regio- and Diastereoselective Cyclization of Difunctional Allylic <i>N</i>-Tosylcarbamates. A Convenient Synthesis of Optically Active 4-Vinyl-2-oxazolidinones and Total Synthesis of 1,4-Dideoxy-1,4-imino-<scp>l</scp>-xylitol
作者:Aiwen Lei、Guosheng Liu、Xiyan Lu
DOI:10.1021/jo0161429
日期:2002.2.1
A Pd(II)-catalyzed cyclization of difunctional allylic N-tosyl carbamates in the presence of halide ions was developed with high regio- and diastereoselectivity. The reaction involves aminopalladation of alkene and beta-heteroatom elimination to regenerate Pd(II) species. When the readily available homochiral alcohols were used as substrates, highly optically active 4-vinyl-2-oxazolidinones were easily
具有高区域选择性和非对映选择性的Pd(II)催化双功能烯丙基氨基甲苯基氨基甲酸酯在卤化物离子存在下的环化反应。该反应涉及烯烃的氨基钯催化和β-杂原子消除,以再生Pd(II)物质。当将容易获得的高手性醇用作底物时,容易获得高旋光性的4-乙烯基-2-恶唑烷酮。该方法的实用性以方便地合成1,4-二脱氧-1,4-亚氨基-L-木糖醇为例。