Intramolecular Diels-Alder reactions of internally-substituted trienylsulfones. Synthesis of bicyclo[4.3.0] and -[4.4.0] systems possessing a bridgehead sulfonyl group
作者:Martin C. Clasby、Donald Craig、Alexandra M.Z. Slawin、Andrew J.P. White、David J. Williams
DOI:10.1016/0040-4020(94)01045-2
日期:1995.1
possessing internally-activated vinylic sulfone dienophilic groups undergo intramolecular Diels-Alder (IMDA) reaction with high or complete selectivity for the cis-fused products. Incorporation of silyloxy groups within the carbon tether linking the diene and dienophile results in increased IMDA reactivity. The stereochemical outcomes of these processes are rationalised in terms of the preference for an exooriented
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-Alderreactions 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.