G. Mehta et al., A SHORT, UNEXPECTED ENTRY INTO THE 1.0(2,6).0(5,10)]UNDECANE(2,8-ETHANONORADAMANTANE) SYSTEM - X-RAY CRYSTAL-STRUCTURE OF A SUBSTITUTED DERIVATIVE, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 35(6), 1996, pp. 524-527
Diels-Alder adduct 2 of 6,6-dimethylfulvene and methyl acrylate can be
readily cyclopentannulated via Pauson-Khand reaction to furnish the e
xo-tricyclic compounds 3 and 4. Both 3 and 4, on exposure to BF3-ether
ate in benzene, undergo novel transannular cyclization to give 2,8-eth
anonoradamantane derivatives 5 and 6, respectively in excellent yield.