LANGE, J. H. M.;KLUNDER, A. J. H.;ZWANENBURG, B., TETRAHEDRON LETT., 30,(1989) N 1, C. 127-130
作者:LANGE, J. H. M.、KLUNDER, A. J. H.、ZWANENBURG, B.
DOI:——
日期:——
Synthesis of bridged [4.3.3]oxapropellanes by angular condensation of ethyl tricyclodecadienone 2-carboxylate and their thermal conversion into lactone annelated cyclopentenones
作者:J.H.M. Lange、A.J.H. Klunder、B. Zwanenburg
DOI:10.1016/s0040-4039(01)80342-7
日期:——
Condensation of tricyclodecadienone ester 2 with aldehydes and ketones leads to oxapropellanes 6 in good yields. With benzaldehyde, this reaction appears to be stereospecific. The lactones 6 undergo a rapid stereo- and regiospecific nucleophilic 1,4-addition to give 9 and 10. Flash vacuum thermolysis of the latter compounds leads to lactone annelated cyclopentenones 11 in excellent yields.