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Androstenes methoxy

Acetophenone, 4 methoxy 2 (p-methoxyphenyl)-, 40,16 30 Acetoxy-5 androstene 170-car-boxylic acid, 42, 4 30-Acetoxyetienic acid, 42, 4 3/8-Acetoxy-S pregnen-20 one, conversion to 3/3-acetoxyetienic acid, 42, 5... [Pg.105]

Phenylselenolactonization.1 This reaction has been used to prepare 24,20-steroidal lactones (3a and 3b). Thus reaction of la and lb, prepared in several steps from 3p-methoxy-5-androstene-17-one, with QH5SeCl (2 equiv.) and (1 equiv.) yields directly the unsaturated lactones 2a and 2b which are reduced by diimide to 3a and 3b. [Pg.26]

Whereas a,/ -unsaturated ketones afforded with DIB a-hydroxy-/ -methoxy dimethylacetal derivatives (Section 3.2.2), some steroidal ketones of this kind showed a deviation when treated with o-iodosylbenzoic acid for example, 4-androstene-3,17-dione gave a mixture of two methoxy derivatives and a diene [5]. Several sulphides were oxidized efficiently to sulphoxides by o-iodosylbenzoic acid in acetic acid-sulphuric acid, at room temperature [3]. o-Iodosylbenzoic acid is an excellent reagent for the rapid, catalytic cleavage of reactive esters, especially phosphates, some of which are in stock in big quantities for use as potential nerve gases. This kind of reactivity has drawn considerable attention, and several analogues of the parent acid showed better catalytic activity among them, a series of structurally interesting pyridinium 1,5-zwitterions should be mentioned [6] ... [Pg.212]

Three steroids that lack the A -3-keto chromophore [3)3-hydroxy-5-androstene-17)8-carboxylic acid, 3-methoxy-l,3,5 (10) -estratrien-17)8-ol, and 3jff-hydroxy-5-pregnen-20-one] and are competitive inhibitors of the enzyme do not stimulate photoinactivation of the enzyme to a rate greater than that of a steroid-free control. The stimulation of photoinactivation required a steroid that bound at the catalytic site and possessed the A -3-keto chromophore. [Pg.477]

Koch, H. J., H. Pfenninger, and W. Graf Quassinoid Bitterstoffe 11 -Oxo-2-methoxy-4a-methyl-17P-hydroxy-A -5a-androsten als Modell fur den Ring A des Quassins. Helv. Chim. Acta 58, 1727 (1975). [Pg.261]


See other pages where Androstenes methoxy is mentioned: [Pg.305]    [Pg.219]    [Pg.318]    [Pg.318]    [Pg.318]    [Pg.318]    [Pg.606]    [Pg.606]    [Pg.726]    [Pg.298]    [Pg.260]   
See also in sourсe #XX -- [ Pg.433 ]

See also in sourсe #XX -- [ Pg.433 ]

See also in sourсe #XX -- [ Pg.98 , Pg.433 ]




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