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The reaction of p-quinone 1 with ylides 2a and 2b afforded the corresponding phosphonium salts 8a,b, p-quinone-dimethanides 4a,b(Z) and 5a,b(E); substituted phenols 7a,b(Z and E) and coumarin-derivative 11 (only with 2a). The reaction of 1 with ylide 2c gave, besides 4c, 5c and 8c, hydroquinone[1]cyclobutene 16 and the Diels-Alder product 17. Reactions of 1 with 2d and 3 (salts) in the presence...
The reactions of the entitled compounds (4a) and (4b) with some phosphonium ylides (5a-d) have been studied in considerable detail. By applying the Wittig reagents (5a,b) on the thiazolidinones (4a,b) in refluxing ethyl acetate and in the presence of triethylamine, conjugated dihydro-furo[2,3-d]thiazol-2(3H)-ones (7a-d) were obtained while carrying out the reaction in refluxing toluene and also in...
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