The First Synthesis of Some Spiro[2,3-Dihydro-2,2-Dimethylbenzofuran-3,1'-Cyclopropanes] through, Mo(CO)6 Catalyzed, One Pot Claisen Rearrangement-Cyclization Reaction of 2-Cyclopropylidene-Aryloxy Alkanes
Synthesis of Tertiary Cyclobutanols through Stereoselective Ring Expansion of Oxaspiropentanes Induced by Grignard Reagents
作者:Angela M Bernard、Costantino Floris、Angelo Frongia、Pier P Piras
DOI:10.1016/s0040-4020(00)00369-0
日期:2000.6
The stereoselectivity of the ringexpansion of oxaspiropentanes to cyclobutanols induced by Grignard reagents has been studied. It has been found that the reaction occurs through the intermediacy of a cyclobutanone, formed stereospecifically, whereas the attack of the Grignard reagent on the carbonyl group of the cyclobutanone is stereospecific only in the case of the oxaspiropentanes derived from
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.