Graham TJA, Gray EE, Burgess JM, Goess BC. An efficient synthesis of (+/-)-grandisol featuring 1,5-enyne metathesis.
J Org Chem 2010;
75:226-8. [PMID:
19957923 DOI:
10.1021/jo9020375]
[Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An eight-step synthesis of (+/-)-grandisol features a key sequence involving a high-yielding, microwave-assisted enyne metathesis to yield a 1-alkenylcyclobutene that is semihydrogenated to yield a silyl-protected grandisol. Metathesis catalyst screens revealed an intriguing trend whereby substrate conversion correlated strongly with the identity of the ligands on the catalyst. In addition, new reactivity of 1-alkenylcyclobutenes toward hydrogenation is described.
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