The present invention covers 5-aryl-3,9-diazaspiro[5.5]undecan-2-one compounds of general formula (I) and general formula (I-a): (I) and (I-a), in which R1, R2, R3 and R4 are as defined herein, methods of preparing said compounds, intermediate compounds useful for preparing said compounds, pharmaceutical compositions and combinations comprising said compounds and the use of said compounds for manufacturing pharmaceutical compositions for the treatment and/or prophylaxis of diseases, in particular of hyperproliferative disorders, as a sole agent or in combination with other active ingredients.
Derivatives of the product of Baker's yeast reduction of ethyl acetoacetate as precursors of free radical chirons of the 2(S)-hydroxypropyl moiety
作者:Mourad Hamdani、Bernard De Jeso、Hervé Deleuze、Bernard Maillard
DOI:10.1016/s0957-4166(00)82196-5
日期:1991.1
Baker's yeast reduction of ethyl acetoacetate provided in good yield ethyl 2(S)-hydroxybutanoate. The hydrolysis of the ester function after protection of the hydroxyl yielded an acid which, under BARTON'S free radical decarboxylation conditions, produced a free radical chiron of 2(S)-hydroxypropyl moiety; according to the reaction medium various chiral products from reaction of this entity were produced
(S)-(+)-4-Nitro-2-butanol (1) obtained by the stereoselective reduction of 4-nitro-2-butanone by bakers’ yeast was employed for the syntheses of natural products. A precursor of (+)-brefeldin A is synthesized starting from this chiral building block by 10 steps short-cut procedure compared with the shortest method so far reported. (S)-(+)-Sulcatol is obtained in much better enantiomeric purity than those reported. The reactivity of 1 in base-catalyzed condensations with Michael acceptors or aldehydes is largely affected by a base employed as the catalyst.
Optical resolution, absolute configuration, and activity of the enantiomers of proxyphylline
作者:Kirsten Selvig、Merete Ruud-Christensen、Arne J. Aasen
DOI:10.1021/jm00364a029
日期:1983.10
The enantiomers of proxyphylline have been separated via their corresponding camphanates. Synthesis of (+)-proxyphylline from theophylline and (S)-propylene oxide derived from (S)-lactic acid established the absolute configuration of the (+) and (-) isomer as S and R, respectively. The activity of the enantiomers as cyclic nucleotide phosphodiesterase inhibitors was tested in human lung tissue homogenate
Cyclisation (formation of derivatives of 2-methylidene-cyclopentanol or cyclohexanone) with inversion of configuration and retention of optical activity is observed during the solvolysis of secondary γ-allenic tosylates.