By J R Hanson; R B Boar; Royal Society of Chemistry.; et al

ISBN-10: 0851863469

ISBN-13: 9780851863467

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Vichnewski, A. P. Lins, W. Herz, and R. Murari, Phytochemistry, 1980, 19,685. e. A13+> Li' > Na' > K ' , whereas the rate of intramolecular transfer is in the reverse order. Also the rate of the intramolecular hydride shift increased with increasing basicity of the medium. These results have been interpreted in terms of the cyclic transition state (25 1)for intramolecular transfer and (252) for the intermolecular process. l14Oxidation of (254), followed by treatment with methyl-lithium and dehydration yielded a mixture '" 'I4 F.

Terpenoids and Steroids 30 O m o H H i A (194) R’ = R2 = H (195) R’ = H , R 2 = OH (196) R’,R2 = 0 A , (197) previously known compound gmelofuran. These eight compounds have also been identified as constituents of the heartwood of the related species H. tiliaceus (from Fiji and Sri Lanka). ’~ The data for this compound correspond closely to those given for hibiscone B (195) and hence they may be identical, in which case a structural revision is required. 3The biogenesis of the latter compound is considered to be as shown in Scheme 24.

A. Talvitie, K. G . Widen, and E. L. Seppa, Finn. Chem. , 1980,62. '*' D . Andina, M. D e Bernardi, A. Del Vecchio, G. Fronza, G. Mellerio, G . Vidari, and P. Vita-Finzi, 129 43 Sesquiterpenoids (295) (296) R' = H , R 2 = OH (297) R' = R2 = H (298) R' = O H , R 2 = H Prompted in part by the significant antibiotic and antitumour properties of several members of the hirsutane class of sesquiterpenoids, there has been a dramatic surge in synthetic endeavour towards these compounds. In this context three independent syntheses of hirsutene (302) have been announced in the 'year under review.

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A review of the literature published between September 1979 and August 1980 by J R Hanson; R B Boar; Royal Society of Chemistry.; et al


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