Abstract The reaction of 17,17-dichloro-androst-16(E)-chloromethylene with secondary amine base afforded substitution products of exocyclic D-ring ketones, in contrast to the reaction of alkaline base which cleaved steroidal D-ring to des-D formyl alkyne. The des-D formyl alkyne was employed to prepare D-ring annulated isoxazolo steroid via 1,3-dipolar nitrile oxide cycloadditionreaction.
摘要 17,17-二氯-雄甾醇-16( E )-氯亚甲基与仲胺碱的反应提供环外D-环酮的取代产物,而碱性碱的反应将甾体D-环裂解为脱-D-甲酰基炔烃。脱-D 甲酰基炔用于通过 1,3-偶极腈氧化物环加成反应制备 D 环环化异恶唑类固醇。
Synthesis of D-Ring Annulated Pyridosteroids from β-Formyl Enamides and Their Biological Evaluations
Herein, we report the synthesis of a novel class of substituted androst[17,16-b]pyridines (pyridosteroids) from the reaction of β-formyl enamides with alkynes in high yields. The optimized reaction protocol was extended to acyclic and cyclic β-formyl enamides to afford nonsteroidal pyridines. Cell survival assay of all compounds were carried against prostate cancer PC-3 cells wherein 3-hydroxy-5-en-2′
本文中,我们报道了从β-甲酰基酰胺与炔烃的高收率反应中合成一类新型的取代的[17,16- b ]吡啶(吡啶类固醇)。优化的反应方案扩展到无环和环状β-甲酰胺,以提供非甾体吡啶。对前列腺癌PC-3细胞进行所有化合物的细胞存活测定,其中3-羟基-5-en-2′,3′-二甲乙氧基-雄酮[17,16- b ]吡啶显示出最高的细胞毒活性。相差显微镜和流式细胞术研究显示了在3-hydroxy-5-en-2',3'-dicarbethoxy-androst [17,16- b ]吡啶和阿比特龙处理的PC-3细胞中凋亡的显着形态学特征。3-hydroxy-5-en-2',3'-dicarbethoxy-androst [17,16-b ]吡啶诱导前列腺癌PC-3细胞中G 2 / M期细胞周期停滞。3-羟基-5-en-2',3'-二碳乙氧基-雄酮[17,16- b ]吡啶和阿比特龙通过激活caspases-
Augmentation of steroidal β-formylenamide with pyrazolo and benzimidazo moieties: A tandem approach to highly fluorescent steroidal heterocycles
A facile synthesis of pyrazolo[1,5-a]pyrimidine and benzimidazo[1,2-a]pyrimidine annulated steroids is described from the novel reaction of β-formyl enamides with amino pyrazoles, indazoles and benzimidazoles. Several of the products exhibited fluorescence properties with high quantum yields.
从β-甲酰胺基与氨基吡唑,吲唑和苯并咪唑的新型反应中,可轻松合成吡唑并[1,5- a ]嘧啶和苯并咪唑并[1,2- a ]嘧啶环化的类固醇。几种产品显示出具有高量子产率的荧光性质。
A facile 1,5-rearrangement of β-formylenamides and cleavage of esters catalysed by Pseudomonas fluorescens
β-Formylenamides undergo a facile 1,5-rearrangement of their N-acetyl groups under the influence of the soil bacterium Pseudomonas fluorescens to afford β-acetoxyenones in good yields. Further, the soil microorganism efficiently cleaves steroidal and non-steroidal acetates to alcohols.
A CONVENIENT SYNTHESIS OF OXETENE VIA [2<b>+</b>2]CYCLOADDITION REACTION UNDER MICROWAVE IRRADIATION
作者:M. Longchar、U. Bora、R. C. Boruah、J. S. Sandhu
DOI:10.1081/scc-120014973
日期:2002.1
ABSTRACT A facile and fast preparation of oxetene has been reported by a microwave mediated [2+2]cycloadditionreaction of steroidal formyl enamides and alkynes in a solventless condition.