Trachylobanic acid

Neoabietic acid, T32.il Levopimaric acid, T32.il Palustric acid, T32.il Abietic acid, T32.il, T"33, D"4 Pimaric acid, T32.14, T"32 Isopimaric acid, T32.18 Cyathin A2, T 13.7 Isoagatholactone, T 14.2, T"39 Sandaracopimaric acid, T32.18 Trachylobanic acid, T35.6 3-Hydroxy-7-kemp-8-en-6-one, T"37.15 C20H30O3... [Pg.248]

Trachelanthamidine, K22 Trachelanthamidinic acid, K22 Trachelanthic acid, K24 Trachylobanic acid, T35 Trehalose, Cl ... [Pg.169]

The deketalization-retroaldol-aldol procedure was applied to compound (100). Acid catalyzed deketalization, followed by the retroaldol-aldol process afforded (101), which could be transformed to the diterpene trachylobane (102)31>. [Pg.100]

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]

Four structural types of diterpenes are known from Helianthus labdanes, kauranes, atisiranes and trachylobanes (Figure 2), with the tetracyclic kaurane type being the most widespread in the genus. The majority of Helianthus diterpenes have an Ol-oriented carboxylic acid function attached to carbon 4. [Pg.435]

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]

Treatment of c t-trachyloban-19-oate 8 with thallium(III) acetate in acetic acid resulted in cleavage of the most strained bond of the three-membered ring to afford the corresponding diacetate together with elimination products. ... [Pg.1956]

The Trachylobane Series.-—Ciliaric acid has been isolated from Helianthus ciliaris and shown to be 7a-hydroxytrachyloban-19-oic acid. [Pg.180]

There are a number of branches between MVA and ent-kaurene that lead to biologically important terpenes other than the gibberellins for example, in plants, a branch at IPP leads to the side chain of cytokinins a branch at FPP leads to squalene and the sterols, also abscisic acid branches at GGPP lead to phytoene, fatty acid esters, chlorophyll esters and non-cyclic diterpenes and branches at CPF lead to (-)-trachylobane, (-f)-beyerene, ( f)-sandaracopiinaradiene (21) and ent-isokaurene (22). (For a review of the pathway to ent-kaurene see reference 23). [Pg.29]

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]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...