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- W2103758557 abstract "Für die Umwandlung von Triterpenoiden in 14-Methyl- oder 4α.14-Dimethyl-sterode wird ein neues Verfahren beschrieben, das auf der bekannten photochemischen Spaltung von Cyclopentylnitriten beruht. Damit wird 4α.14-Dimethyl-zymosterolacetat (8b: RCH3, R'CH3CO, YH) aus Lanosterold (1b: YH) synthetisiert. Es ist identisch mit dem Acetat eines Sterols aus Kartoffelblättern die dieser Verbindung zugeordnete Konstitution2) wird damit bestätigt. Ferner wird über einige Untersuchungen zur Abwandlung des Ringes A im Cycloartanol (16) berichtet. Photochemical Transformations, XXVII1). New Partial Synthesis of 4-Demethyl and 4-Bisdemethyl Triterpenoids. The Synthesis of 4a, 14-Dimethyl-zymosterol Acetate A new procedure, based on the known photochemical cleavage of cyclopentyl nitrites, has been developed for the conversion of triterpenoids into 14-methyl-or 4a, 14-dimethyl-steroids. In the course of this work 4a, 14-dimethyl-zymosterol acetate (8b: RCH3, R' CH3CO, YH) has been synthesised from lanosterol (1b: YH) and shown to be identical with the acetate of a sterol from potato leaves. The constitution assigned to this sterol2) has thus been confirmed. Some studies in ring A modification of cycloartanol (16) are also reported." @default.
- W2103758557 created "2016-06-24" @default.
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- W2103758557 date "1970-08-27" @default.
- W2103758557 modified "2023-10-09" @default.
- W2103758557 title "Photochemische Umwandlungen, XXVII1) Neue Partialsynthese von 4-Desmethyl- und 4-Bisdesmethyltriterpenoiden Synthese von 4α.14-Dimethyl-zymosterolacetat" @default.
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- W2103758557 doi "https://doi.org/10.1002/jlac.19707370112" @default.
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