Ultrasound assisted remote functionalization of non-activated carbon atoms: efficient in situ formation of tetrahydrofurans by sonolysis of bromohydrins with
作者:Saul C.P. Costa、M.J.S.Miranda Moreno、M.Luisa Sáe Melo、AndréS. Campos Neves
DOI:10.1016/s0040-4039(99)01849-3
日期:1999.12
Ultrasonic irradiation of bromohydrins in the presence of (diacetoxyiodo)benzene and I2 generates alkoxyl radicals which lead in situ to intramolecular hydrogen abstraction on the C-19 non-activatedcarbonatoms in steroids producing tetrahydrofurans selectively in very good yields. Photolysis was less effective in promoting such conversions.
Convenient preparative routes to 19-hydroxy, 19-oxo-, 19-oic-, and 19-nor-deoxycorticosterone
作者:T. Terasawa、T. Okada
DOI:10.1016/s0040-4020(01)87452-4
日期:1986.1
synthetic routes to 19-hydroxy-, 19-OXO-, 19-oic-, and 19-nor-deoxy-corticosterone were developed. 19-Hydroxydeoxycorticosterone (11) and its 21-acetate 10 were first prepared by two routes via O-protected 19-oxygenated intermediates 6 and 17 starting from readily available pregnenolone acetate (1) and dehydroepiandrosterone acetate (12). The key step in the first route is the application of Henbest acetoxylation
[EN] COMPOUNDS AND METHODS FOR TREATING NEOPLASIA<br/>[FR] COMPOSÉS ET PROCÉDÉS POUR LE TRAITEMENT DE LA NÉOPLASIE
申请人:MEDEXIS S A
公开号:WO2012013816A1
公开(公告)日:2012-02-02
The invention features compounds, pharmaceutical compositions and methods useful for the treatment of neoplasia. In particular embodiments, the compounds of the invention are useful for the treatment of multidrug resistant neoplasia.
Synthesis and characterization of a fluorescent steroid dimer linked through C-19 by a 1,4-Bis(phenylethynyl)phenylene fragment
作者:Josué Vazquez-Chavez、Andrés Aguilar-Granda、Martín A. Iglesias Arteaga
DOI:10.1016/j.steroids.2022.109098
日期:2022.11
The synthesis and characterization of a dimer in which two nuclei of 3β-acetoxy-19-hydroxyandrost-5-en-17-one are linked by the fluorescent 1,4-bis(phenylethynyl)phenylene bridge attached to the oxygenated functions at positions C-19 of each steroid fragment is described. The compound was obtained in five steps and 23 % overall yield and showed a strong blue emission with a quantum yield of 0.66.
二聚体的合成和表征,其中两个 3β-乙酰氧基-19-羟基雄雄-5-en-17-one 核通过荧光 1,4-双(苯乙炔基)亚苯基桥连接,该桥连接到位置 C 的含氧官能团描述了每个类固醇片段的-19。该化合物通过五个步骤获得,总产率为 23%,并显示出强烈的蓝色发射,量子产率为 0.66。