Furans from Novel [3 + 2] Photocycloaddition of Alkenes to 2-(1-Alkynyl)cyclohexenones
作者:Paul Margaretha、William C. Agosta、Stefan Reichow
DOI:10.1021/jo00097a049
日期:1994.9
Photocycloaddition of 2-alkynyl-substituted cyclohexenones 8c-11c with isobutylene (2) and tetramethylethylene (3a) leads to tricyclic furans 15a-18a and 15b-17b; respectively, in gas chromatographic yields of similar to 90%. A suggested mechanism for this novel-process is shown in eq 2. Tetramethoxyethylene (3b) gives only oxetanes 22 and 23, and the 3-methyl-substituted ketone 12c fails to react with 2 and 3a,b. tert-Butylethylene gives [2 + 2] adduct 24 with 10c.