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A review of the literature published between September 1978 by J R Hanson; Royal Society of Chemistry

By J R Hanson; Royal Society of Chemistry

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Saito, Chem. Pharm. , 1978, 26, 2346. M. Fukuoka, M. Kuroyanagi, K. Yoshihira, and S. Natori, Chem. Pharm. , 1978, 26, 2365. Sesq u iterpe noids 43 0 R1o 0 (273) R' = H, R2 = H2 (275) R' = Ang, R2 = 0 (274) twenty-four of these pterosins have been identified. All of them have the basic CI4 (277) or C15structure (278) and are hence classified as illudalane (secoprotoilludane or secoilludane) sesquiterpenoids. Although it has been known for many years that bracken fern contains carcinogenic constituents it would seem from these present studies that none of the pterosins or their glucosides, the pterosides, is responsible for the carcinogenicity.

F. Bohlmann, L. N. Dutta, W. Dorner, R. M. King, and H. Robinson, Phytochemistry, 1979,18,673. Y. Uchio, Tetrahedron, 1978,34, 2893. A. Matsuo, S. Uto, K. Sakuda, Y. Uchio, M. Nakayama, and S. Hayashi, Chem. , 1979, 73. R. P. Deshpande, A. S. C. Prakasa Rao, and U. R. , 1978,4423. S. N. Suryawanshi and U. R. , 1978,4425. S. N. Suryawanshi and U. R. , 1978, 4429. & Sesquiterpenoids N, 35 + i, ii ___* iii-vi N, NMe, (Me0)2HC “OCOPh NMe, 1yii. viii c-- *--- “OCOPh “OCOPh HO,C xv + OCOPh v, xvi ___, Br I xvii OCOPh o@oH a ~ xviii, xix -4 Br Reagents: i, LDA; ii, BrCH,CH,CH(OMe),; iii, aq.

A. Christenson and B. J. Willis, J. Org. , 1979,44, 2012. 64 M. Baurnann and W. Hoffrnann, Justus Liebigs Ann. , 1979,743. 6 5 D. -J. , 1979, 3957. 6o 61 19 Sesquiterpen oids liii Reagents: i, MeC0,H; ii, CH,CO,-; iii, H'; iv, Bu',AlH; v, Me,C=PPh,; vi, POCI,-py Scheme 17 i, vi, ii 1 Reagents: i, H,-Pd; ii, MeOH-H'; iii, Bu'O-; iv, H,O'; v, EtCOMe-base; vi, HC0,Me-MeO-; vii, LiAlH4 Scheme 18 v-viil ' (110) Reagents: i, CrO, . py; ii, (EtO),P(O)CHCN; iii, Mg-MeOH; iv, PhSCl; v, Bu',AlH; vi, LiEt,BH; vii, Raney-Ni Scheme 19 20 Terpenoids and Steroids Full papers on the syntheses of (&)-isoalbene (111)and (-)-albene (112) have been Although there is no doubt that in this nice piece of work Kreiser et al.

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