Perkin communications. Acid-catalysed rearrangement of the Diels–Alder adducts of activated quinones
作者:Francisco Fariña、M. Carmen Paredes、Jaime A. Valderrama
DOI:10.1039/p19900002345
日期:——
The Diels–Alderadducts (1)–(5) in the presence of the hydrochloric acid undergo a 4a,5 carbon–carbon bond fission to give rearranged compounds of type (9), (10), or the dihydrobenzofurans (11)–(14). Compound (16), obtained by hydrolysis of the adduct (15), rearranges to (17) in the presence of ethanol and silica gel.
FARINA, FRANCISCO;PAREDES, M. CARMEN;VALLDERRAMA, JAIME A., J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N, C. 2345-2346
作者:FARINA, FRANCISCO、PAREDES, M. CARMEN、VALLDERRAMA, JAIME A.
DOI:——
日期:——
Studies on quinones. 24. Rearrangement of Diels-Alder adducts of activated quinones under acidic conditions
作者:Francisco Fariña、M.Carmen Paredes、Jaime A. Valderrama
DOI:10.1016/s0040-4020(01)81237-0
日期:1992.1
The Diels-Alderadducts 4, 19, 9, 10, 8, 11, of benzoquinones bearing activating groups (COCH3 COCH=CHPh, CO2Me, NO2 CHO, CN) by treatment with 1,3 N hydrochloric acid are initially converted into the dihydrobenzofurans 7, 22, the corresponding alcohols 12, 13 or the arylcrotonaldehydes 14, 15, respectively. By treatment with 8.5 N hydrochloric acid, adducts 8–10 are converted directly into the corresponding