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Trachyloban-19-oic acid

Varieties of sunflower (Helianthus annums, Asteraceae) that are resistant to attack by larvae of the sunflower moth (Homeosoma electellum) contain high concentrations of trachyloban-19-oic acid and (-)-16-kauren-19-oic acid in their florets (84,132). [Pg.314]

Bicycloannelation.1 The a -enolate of an a,j -cyclohexenone reacts with this phosphonium salt to form a tricyclof3.2.1,0 ]octane in low to moderate yield. This reaction was used in a short synthesis of the pcntacyclic dilcrpcnc trachyloban-19-oic acid (4). Reaction of the lithium enolale of 2, prepared from podocajpic acid, with I provided the pcntacyclic ketone 3, which was reduced by the Wolff-Kishncr reaction to 4. [Pg.225]

Pyrek, J. S. 1970. New pentacyclic diterpene acid trachyloban-19-oic acid from sunflower. Tetrahedron 26, 5029... [Pg.136]

Trachylobanes.—Trachyloban-19-oic acid (92), together with ( —)-kaur-16-en-19-oic acid, has been isolated from Helianthus annuus. The structure was confirmed by the use of n.m.r. shift reagents. [Pg.145]

N-Tosylazetidin-2-imines, 60 Tosylhydrazones, 47 N-Tosylketenimines, 60 Tosylmethylisocyanide, 409 Trachyloban-19-oic acid, 225 Transsilylation, 62... [Pg.267]

A novel Wittig reaction of cyclohexenones using vinylphosphonium ylides leads to the construction of the cyclopropane ring and this has found application in the stereoselective synthesis of trachyloban-19-oic acid. A further synthesis of gibberone has been reported.The sesquiterpenoid santonin formed the starting material for syntheses of pachydictyol and dictyolene. ... [Pg.109]

Trachyloban-19-oic acid 15a- isovaleryloxy-893 Trachyloban-19-oic acid, 15a-isobutyryloxy-... [Pg.58]

Trachyloban-19-oic acid thujanol ester, ent-1204 Tachyloban-19-oic acid methyl ester... [Pg.58]

See other pages where Trachyloban-19-oic acid is mentioned: [Pg.233]    [Pg.103]    [Pg.58]    [Pg.58]    [Pg.58]    [Pg.58]    [Pg.58]    [Pg.58]    [Pg.58]    [Pg.487]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.624]    [Pg.625]    [Pg.625]    [Pg.625]   
See also in sourсe #XX -- [ Pg.225 ]

See also in sourсe #XX -- [ Pg.103 ]

See also in sourсe #XX -- [ Pg.103 ]

See also in sourсe #XX -- [ Pg.29 , Pg.103 ]

See also in sourсe #XX -- [ Pg.415 ]



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