Iminium ion cascade reactions: stereoselective synthesis of quinolizidines and indolizidines
作者:Shawn M. Amorde、Ivan T. Jewett、Stephen F. Martin
DOI:10.1016/j.tet.2008.10.074
日期:2009.4
A noveliminiumion cascade reaction has been developed that allows for the stereoselective synthesis of a variety of substituted aza-fused bicycles. The combination of amino allylsilanes and aldehydes (or ketones) was used to synthesize a number of quinolizidines and indolizidines in a one-pot reaction sequence. This technology has been used to effect the facile syntheses of several indolizidine and
Utilization of a Michael Addition: Dipolar Cycloaddition Cascade for the Synthesis of (±)-Cylindricine C
作者:Andrew C. Flick、Maria José Arevalo Caballero、Albert Padwa
DOI:10.1021/ol8006056
日期:2008.5.1
A new approach to the marine alkaloid (+/-)-cylindricine C has been devised. The key element of the synthesis consists of a Michael addition/dipolar cycloaddition cascade between 2,3-bis(phenylsulfonyl)-1,3-butadiene and 9-triisopropylsilanyloxy-non-1-en-5-one oxime. The resulting cycloadduct was converted into (+/-)-cylindricine C by a sequence of reactions including a reductive cyclization, intramolecular