Stereoselective Intermolecular [2+2] photocycloaddition reactions of tetrahydrophthalic anhydride and derivatives with alkenols and alkynols
作者:Kevin I. Booker-Milburn、Justin K. Cowell、F. Delgado Jiménez、Andrew Sharpe、Andrew J. White
DOI:10.1016/s0040-4020(99)00250-1
日期:1999.4
Intermolecular [2+2] photocycloaddition of a variety of alken- and alkyn-3-ols with 3,4,5,6-tetrahydrophthalic anhydride (THPA) and the related imide (THPI) gave the corresponding cyclobutanes and cyclobutenes in high yield. Irradiation times were relatively short and stereoselectivities as high as for the cyclobutane examples.
Sequential ring-opening/cyclisation reactions of bicyclo[4.2.0]oct-7-enes for the synthesis of cyclooctadiene fused lactones: Model studies towards the total synthesis of pachylactone
作者:Kevin I. Booker-Milburn、F. Delgado Jiménez、Andrew Sharpe
DOI:10.1016/s0040-4020(99)00251-3
日期:1999.4
Substituted bicyclo[4.2.0]oct-7-ene-1,6-dicarboxylic acid derivatrives undergo facile electrocyclic ring opening to give fused cyclooctadiene lactone ring systems in excellent yield on thermolysis in xylene. Use of this reaction as the key step in an approach to the marine diterpene pachylactone 1 is described.