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Pyxine endochrysina

Two new hopanes, methyl pyxinate (172) and the corresponding acetate (173), occurin the lichen Pyxine endochrysina along with several dammaranes. Full papers have appeared on the structure of leucotylic acid (174) and on the correlation of zeorin (175) with leucotylin (176). On treatment with acid, methyl leucotylate (177) and leucotylin (176) afford methyl isoleucotylate (178) and isoleucotylin (179), respectively. [Pg.227]

C30H52O4, Mr 476.74, needles, mp. 225-226 C, [ajp -b62.8 (CHClj). A dammarane triterpenetriol from the lichen Pyxine endochrysina. [Pg.536]

Yosioka, L, H. Yamauchi, and I. Kitagawa Lichen Triterpenoids V. On the Neutral Triterpenoids of Pyxine endochrysina Nyl. Chem. Pharm. Bull. (Japan) 20, 502 (1972). [Pg.71]

Deriv Triacetylpyxinol, needles (MeOH-HjO), mp 180-181 °C, from 3-0-acetylpyxinol with ACjO-NaOAc by heating under reflux for 2h StL Pyxine endochrysina Nyl. [Pg.370]

MeOH-HjO), [a]o + 30.4 (CHCI3, c 1.01), by saponification of diacetyl-12-deoxypyxinol with KOH-MeOH under reflux in 2h StL Pyxine endochrysina Nyl. [Pg.374]

Yosioka I, Yamauchi H, Kitagawa I (1969c) Diacetylpyxinol, a triterpene alcohol from a lichen Pyxine endochrysina Nyl. Tetrahedron Lett 4241-4244... [Pg.474]

In addition to the previously described pyxinic acid (485) 339), Yosioka et al. 345) have isolated methyl pyxinate (486) and methyl 3-0-acetylpyxinate (487) from Pyxine endochrysina. The structure of these esters was verified by direct comparison with the synthetic derivatives obtained from pyxinic acid. [Pg.208]

In addition to diacetylpyxinol (501), Yosioka, Yamauchi, and Kitagawa 345) have identified three new dammarane triterpenoids from Pyxine endochrysina pyxinol (502), 3-0-acetylpyxinol (503) and 12-desoxydiacetylpyxinol (504). [Pg.211]

Neutral Triterpenoids of Pyxine endochrysina. Chem. Pharm. Bull. (Japan)... [Pg.234]

Leucotylic acid (98), phlebic acid A (99), and phlebic acid B (100) are hopane derivatives with a 23-carboxylic acid from Parmelia leucotyliza yl., P. entotheiochroa Hue, and Peltigera aphthosa (L.) Willd. Diacetyl pyxinol (101), known from Pyxine endochrysina yX., possesses adammaran skeleton from X-ray analysis of 3/3, 12/3-di-/ -bromobenzoyl pyxinol. [Pg.515]

See other pages where Pyxine endochrysina is mentioned: [Pg.205]    [Pg.141]    [Pg.381]    [Pg.381]    [Pg.384]    [Pg.687]    [Pg.205]    [Pg.141]    [Pg.381]    [Pg.381]    [Pg.384]    [Pg.687]   
See also in sourсe #XX -- [ Pg.141 ]

See also in sourсe #XX -- [ Pg.108 , Pg.211 ]



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Pyxine endochrysina [Pyxinol

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