The structures of the title steroids I and II were detd. The stereochem. at the C-24 and C-25 positions in I was detd. by asym. synthesis of 1,3-dimethylpentane-1,2-diols as models and comparison of the spectral data of their 1-(+)-MTPA esters with those of the 26-(+)-MTPA ester of the 22,23-dihydro deriv. of the natural material. Similarly the stereochem. at the C-24 position in II was proposed by comparison of the spectral data with those of a model compd.
STRUCTURE ELUCIDATION OF (22E,24R,25R)-24-METHYL-5-ALPHA-CHOLEST-22-ENE-3-BETA,4-BETA,5,6-ALPHA,8,14,15-ALPHA,25,26-NONAOL AND (22E,24S)-24-METHYL-5-ALPHA-CHOLEST-22-ENE-3-BETA,4-BETA,5,6-ALPHA,8,14,15-ALPHA,25,28-NONAOL, MINOR MARINE POLYHYDROXYSTEROIDS ISOLATED FROM THE STARFISH ARCHASTER-TYPICUS
RICCIO, Raffaele;
1989-01-01
Abstract
The structures of the title steroids I and II were detd. The stereochem. at the C-24 and C-25 positions in I was detd. by asym. synthesis of 1,3-dimethylpentane-1,2-diols as models and comparison of the spectral data of their 1-(+)-MTPA esters with those of the 26-(+)-MTPA ester of the 22,23-dihydro deriv. of the natural material. Similarly the stereochem. at the C-24 position in II was proposed by comparison of the spectral data with those of a model compd.File in questo prodotto:
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