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New PDF release: Fortschritte der Chemie organischer Naturstoffe / Progress

By Dr. W. Herz, Prof.Dr. H. Grisebach, G. W. Kirby SC. D. (auth.)

ISBN-10: 3709187176

ISBN-13: 9783709187173

ISBN-10: 3709187192

ISBN-13: 9783709187197

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Extra resources for Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products

Sample text

A similar compound (98) also occurs in Guarea thompsonii (200). Nymania I is a methyl ester, analysing for a methanolysis product of prieurianin, with which it co-occurs. r. 5, indicating an orthoester, and this led to the structure (97). A similar orthoester had previously been found in the hydrolysis products of dregeanin (63, 133). 0 RU·/

The [email protected][tWte Limonoids from Meliaceae ""'0 H 2 S0 4 23 C0 2 Me, I : ". These spontaneously form 1,8-ketals, which are identified by the characteristic ketal carbon resonance at 8 109. It is probable that these are formed from 8, 14cr-oxides (45), which are also naturally occurring in x. moluccel1sis (200) and open with acid to give 8cr-hydroxy-~14,15Gompoungs. The naturally occurring compounds such as xyloccensin F (46) which lack the 14,15-double bond appear to be produced by a reduction process, as must be the rare mexicanolide derivatives containing no double bond (2,9,191).

Paniculatus C. paniculatus Chisocheton panicli/mUS Dysoxylon binectariferum A. indica Khaya anthotheca Azadirachta indica Origin 6a-Acetoxyazadirone 15 16 22D' 20: 2~ Structure Name Table 2. Havanensin Group (88, 98) (98) (58) (64) (64) (64) (64) (176) (181) (121) (98) (141) References >-3 i:l" V> V> "''" ~. ~ ~ S o 8. 0. , Q 0;' r '"(") ~ I ...... ~ ~ a [ ~ la,3a,6a,7a,12a-pentahydroxy, 28-oxo, 8 '4 ,15_diacetate Sendenal Trichilenone 3-oxo, 8 1 ,2, 7-acetate Co 12-oxovilasinin triacetate Nimbidinin (3) 14,15-epoxy,a-hydroxy Vilasinin-I ,3-diacetate-7-cinnamate Nimbolin A (164) (64) (164) (9, 155) (64) References T.

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Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products by Dr. W. Herz, Prof.Dr. H. Grisebach, G. W. Kirby SC. D. (auth.)


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