TMSOTf, transannular

TMSOTf, 111-12.119,122-3,139 p-Toluene-sulphinic acid, 16 Transannular bromodesilyladon, 15 Transmetallation, 10 Tributytin methoxide, 115 Trichlorosilane, 9,10,58 ( )-l-Trichlorosilylhex-l-ene, 9 Tridcca-l,2-dienc, 69... 

Finally, transannular cyclization involving the A > - rather than the A -double bond in humulene-4,S-epoxide (150) can be achieved by first converting (150) to the corresponding aldehyde (159). Treatment of (159) with TMSOTf is then shown to lead to the fused S,7-ring system (160) in good yield (equation... 

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