Tetrahedron Letters p. 3627 - 3630 (1982)
Update date:2022-08-11
Topics:
Nakano, Tatsuhiko
Spinelli, A. C.
Martin, A.
Usubillaga, A.
McPhail, Andrew P.
Onan, Kay D.
Cleavage of the epoxide (2) of methyl (-)-kaur-9(11)-en-19-oate (1b) with boron trifluoride-ether in benzene and in acetic anhydride yielded (3a) and (3b), respectively.On epoxidation with m-chloroperbenzoic acid in the presence of N-nitrosomethyl urea, (1b) suffered a backbone rearrangement to form (6).
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