ChemInform Abstract: Cyclobutane Structures Fused to a 13-Membered Ring

The structures of two diastereomers, (1R * ,6aS * , 14aS * ,14bR * ,13E)- and (1R * ,6aR * ,14aR * ,14bS * ,13E)-1,14a-dimethyl-1,2,6,6a,7,8,9,10,11,12-decahydro-4H,5H,14aH-6a,14c-epoxy-3-cyclobuta[1',2':1,2]cyclopentadeca[2,3,4-b,c]furan-4,5-dione, in which a cyclobutane moiety is fused to a 13-membered ring are reported for the first time. The two diastereomers exhibit similar conformations except for the configuration about the methyl carbon (C15)