Intramolecular Diels-Alder reactions of sulphonyl-substituted trienes. Stereospecific formation of cis-fused bicyclo[4.3.0] and -[4.4.0] systems possessing a bridgehead sulphonyl group
作者:Martin C. Clasby、Donald Craig
DOI:10.1016/0040-4039(92)80032-f
日期:1992.6
The synthesis and thermal intramolecular Diels-Alder reactions of (E)-2-(phenylsulphonyl)-1,6,8-nonatriene 1, (E)-2-(phenylsulphonyl)-1,7,9-decatriene 2, (2E, 7E)-3-(phenylsulphonyl)-2,7,9-decatriene 3, and (2E, 8E)-3-(phenylsulphonyl)-2,8,10-undecatriene 4 are described. The reactions are highly selective for the cis-fused bicyclic products, whose structures are assigned by X-ray crystallography.
(E)-2-(苯基磺酰基)-1,6,8-壬三烯1,(E)-2-(苯基磺酰基)-1,7,9-癸三烯2,(2E)的合成及分子内Diels-Alder热反应描述了7E)-3-(苯基磺酰基)-2,7,9-癸三烯3和(2E,8E)-3-(苯基磺酰基)-2,8,10-十一碳三烯4。该反应对于顺式稠合的双环产物是高度选择性的,其结构通过X射线晶体学确定。底物2经历竞争性二烯异构化-IMDA反应,得到双环[4.3.0]环加合物。