2,2-Dimethyl cyclopentanones by acid catalyzed ring expansion of isopropenylcyclobutanols. A short synthesis of (±)-α-cuparenone and (±)-herbertene
作者:Angela M. Bernard、Angelo Frongia、Francesco Secci、Pier P. Piras
DOI:10.1039/b505707h
日期:——
catalyzed ring expansion of isopropenylcyclobutanols; the method allows ready access to the family of sesquiterpenes cuparanes and herbertanes, as demonstrated by the synthesis of (+/-)-alpha-cuparenone and the direct precursor of (+/-)-herbertene.
The First Facile Synthesis of Some 1,2a,3,8b-Tetrahydro-2H-Cyclobuta[c] Chromenes Through Intramolecular Alkylation of an Aromatic Ring by a Cyclobutanone
作者:Angela M. Bernard、Costantino Floris、Angelo Frongia、Pier P. Piras
DOI:10.1055/s-2002-25355
日期:——
Starting from cyclobutanones several new chromenes containing a cyclobutane ring are prepared. Ring fission of these derivatives gives easy access to functionalized 3-isoflavenes.
Use of cyclobutyl derivatives as intermediates in the synthesis of 1,2a,3,8b-tetrahydro-2H-cyclobuta[c]chromenes
作者:Angela M Bernard、Costantino Floris、Angelo Frongia、Pier P Piras、Francesco Secci
DOI:10.1016/j.tet.2003.11.018
日期:2004.1
Starting from cyclobutanones and tertiary cyclobutanols several new chromenes containing a cyclobutane ring have been prepared by acid catalyzed intramolecular alkylation of an oxygen-carrying aromatic ring. Interestingly one of the cyclobutanols leads to 3-[(4-methoxyphenoxy)methyl]-2,2,3-trimethylcyclopentanone that is a precursor in the synthesis of the carotenoid pigment capsorubin.