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Steroids Dieckmann reaction

Reaction of 17/J-acetoxy-la,2oc-epoxy-lj3-methyl-5a-androstan-3-one (224) with acid gave an isomeric mixture of A-nor-2-oxo-steroids (225) carrying a formyl group at C(l). Treatment of this mixture with base provided exclusively the l/ -methyl-A-nor-steroid (226).The 3a-methyl-A-norandrostane derivative (230) has been prepared as shown in Scheme 16, i.e. by oxidative cleavage of ring A of the 3-keto-derivative (227) followed by Dieckmann condensation of the diester (228), and methylation and decarboxylation of (229). - ... [Pg.371]

See other pages where Steroids Dieckmann reaction is mentioned: [Pg.851]    [Pg.851]    [Pg.851]    [Pg.278]    [Pg.278]    [Pg.376]    [Pg.38]    [Pg.346]    [Pg.34]    [Pg.146]    [Pg.95]   
See also in sourсe #XX -- [ Pg.823 ]

See also in sourсe #XX -- [ Pg.823 ]

See also in sourсe #XX -- [ Pg.823 ]



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Dieckmann

Dieckmann reaction

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