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-
Tetrabutylammonium iodide-catalyzed oxidative coupling of enamides with sulfonylhydrazides: synthesis of β-keto-sulfones
作者:Yucai Tang、Ye Zhang、Kaifeng Wang、Xiaoqing Li、Xiangsheng Xu、Xiaohua Du
DOI:10.1039/c5ob00742a
日期:——
A facile syntheticroutetowards pharmaceutically interesting β-keto-sulfone derivatives by tetrabutylammonium iodide (TBAI)/tert-butyl hydroperoxide (TBHP) mediated oxidative coupling of readily prepared enamides with economical sulfonylhydrazides is described. The corresponding β-keto-sulfone compounds were obtained in moderate to good yields. The present method is metal-free and base-free and shows
Hydrogen peroxide and anhydride mediated transformation of enamides to afford substituted α-acyloxy ketones is described. This transition-metal-free cascade reaction has a broad substrate scope and high efficiency. The acyl intramolecular migration procedure successfully achieved this acyloxylation process under mild conditions and increased the atom efficiency.
Chiral <i>C</i><sub>2</sub>-Symmetric Ligands with 1,4-Dioxane Backbone Derived from Tartrates: Syntheses and Applications in Asymmetric Hydrogenation
作者:Wenge Li、Jason P. Waldkirch、Xumu Zhang
DOI:10.1021/jo020250t
日期:2002.11.1
Chiral 1,4-diphenylphosphines 5-7 as well as thioether 8 were synthesized from tartrates employing Ley's "BDA" and "Dispoke" methodologies as the key step. Rhodium(I) complexes with 5-7 are efficient catalysts for the asymmetrichydrogenation of beta-substituted enamides and MOM-protected beta-hydroxyl enamides, which furnished chiral amines or beta-amino alcohols with 94-->99% ee. These results indicated
A simple and convenient copper‐catalyzed directoxyphosphorylation of enamides with P(O)‐H compounds and dioxygen has been developed under mild conditions. This methodology can allow the synthesis of a series of valuable β‐ketophosphine oxides/β‐ketophosphonates in moderate to good yields with a broad substrate scope simply by using readily‐available starting materials.
作者:Hang Zhao、Charles P. Vandenbossche、Stefan G. Koenig、Surendra P. Singh、Roger P. Bakale
DOI:10.1021/ol7028788
日期:2008.2.1
A new synthesis of enamidesfrom ketones is disclosed that involves a phosphine-mediated reductive acylation of oximes. The resulting enamides are isolated in good yields (up to 89%) and excellent purity, permitting a subsequent hydrogenation to access enantiopure acetamides at catalyst loadings practical for large-scale applications.