Calix[4]quinone. Part 2: Intramolecular Michael-addition of calix[4]diquinone
作者:Ker-Ming Yang、Ming-Dar Lee、Rong-Fua Chen、Yi-Lin Chen、Lee-Gin Lin
DOI:10.1016/s0040-4020(01)00788-8
日期:2001.9
The oxidation of calix[4]arene dibenzoate 1 with chlorine dioxide yielded the corresponding calix[4]diquinone 2 and an intramolecular Michael-addition product 3. Reaction of diquinone 2 with ethylene glycol under acidic conditions produced the half-protected ketal derivative 4. The removal of benzoate moieties from compound 4 in basic conditions produced a phenoxide anion, which underwent intramolecular