The fused-ring system of the title compound, C17H24O2, limits its conformational freedom. The five-membered cyclopentane and furan rings adopt envelope conformations, the tetrahydropyranone ring a boat conformation and the cyclodecanone ring a cyclodecane boat-chair-boat conformation.
Intramolecular4+3cycloadditions. Model studies toward the synthesis of ingenanes
作者:Michael Harmata、Saleh Elahmad、Charles L. Barnes
DOI:10.1016/0040-4039(95)00009-2
日期:1995.2
Cyclic oxyallyls derived from 7, 10 and 12-membered ring precursors undergo intramolecular4+3cycloaddition with a tethered furan to give polycyclic products. The cycloadduct7a derived from cycloheptanone possesses the ABC ring structure of the diterpene isoingenol. Those from cyclodecanone and cyclododecanone are tris and pentakis(homo) C ring analogues of7a and possess the in-out stereochemistry at