Studies towards a postulated biomimetic Diels-Alder reaction for the synthesis of himgravine
作者:Jack E. Baldwin、Richard Chesworth、Jeremy S. Parker、Andrew T. Russell
DOI:10.1016/0040-4039(95)02045-4
日期:1995.12
The possible role of an iminium ion mediated Diels-Alder reaction on the biosynthetic pathway to himgravinc is discussed. The results of a preliminary investigation of a related oxycarbenium ion mediated Diels-Alder reaction are reported and are in accord with the stereochemistry of the natural product.
Cyclization reactions of molybdenum and chromium carbene complexes with 1,6- and 1,7-enynes: effect of tether length and composition
作者:Daniel F. Harvey、Kevin P. Lund、David A. Neil
DOI:10.1021/ja00048a012
日期:1992.10
It has been observed that the reaction of 1,6- and 1,7-enynes with pentacarbonyl(butylmethoxycarbene)molybdenum(0) (18) produces vinylcyclopropanes in good to excellent yield. A systematic investigation into the factors which govern the success of these cyclizations has been performed. Chromium carbenecomplexes also lead to the formation of vinylcyclopropanes but in significantly lower yields. When
Synthesis of a Model System for the Macrocyclic Subunit of the Oximidines
作者:Frank Scheufler、Martin E. Maier
DOI:10.1055/s-2001-16056
日期:——
Cross-coupling reaction of aryl triflate 1 and vinyl stannane 13 provided salicylic acid derivative 15. This compound was converted to the dihydroxy acid 16, which provided in a size-selective macrolactonization the two macrolides 17 and 18 in a ratio of 60 : 40. Compound 17 is a model of the macrocyclic core of the oximidines.