The first Provisional Specification refers to progesterone derivatives prepared by the above process having various substituents such as a hydroxyl group in the 17- or 21-position or in both positions, which may be esterified, a keto or hydroxyl group in the 11-position, and a fluorine or ...
alkaloidsThe haloindolecarboxyaldehydes (I), (IV), and (VI) are thallated and then halogenated to give the dihalo derivatives (III), (V), or (VII).doi:10.1002/chin.198814345T. OHTAFac. Pharm. Sci., Kanazawa Univ., Takara, Kanazawa 920, JapanY. YAMATO...
Substituted spiro-derivatives of 3-(3,5-dihalogenophenyl)-oxazolidine-2,4-diones(thione-ones) of the formula <IMAGE> in which A is oxygen or sulphur, X and Y each independently is halogen, Z each independently is alkyl or a fused cycloalkane or cycloalkene ring, m is 1, 2, 3 or ...
Halogenopicropodophyllotoxins Reacting with Carboxylic Acids Mediated by BF3·Et2O Lingling Fan1,*, Xiaoyan Zhi1,*, Zhiping Che1 & Hui Xu1,2 Stereospecific nucleophilic substitution at the C-4α position of 2α-chloro-2′(2′,6′)-(di) halogenopicropodophyllotoxin derivatives with ...
Photochemical single-step synthesis of β-amino acid derivatives from alkenes and (hetero)arenes. Nat. Chem. 14, 1174–1184 (2022). Article CAS PubMed Google Scholar Majhi, J. et al. Metal-free photochemical imino-alkylation of alkenes with bifunctional oxime esters. J. Am. Chem. Soc. ...
Because of steric repulsion, vinyl groups on 10-position of phenothiazine derivatives have a twisted conformation unless there is a geminal hydrogen atom or charge transfer interaction between phenothiazine moiety and the substituents [44], [45], [46]. Phenothiazines are known to be oxidized at 5...
Alderfer J.L., Danilov V.I., Poltev V.I., Slyusarchuk O.N. A study of the hydration of deoxydinucleoside monophosphates containing thymine, uracil and its 5-halogen derivatives: Monte Carlo simulation // J.Biomol.Struct.Dyn. - 1999. - 16. - P.1107-1117....
′-bis(3-pyridyl-acrylamido) derivatives with dihalogens havebeen explored in terms of N−H···O, N−H···N,and N−H···X hydrogen bonding and N···Xhalogen bonding. The cocrystals exhibit halogen bonding as well asN−H···O hydrogen bonding, while in salts theN...
ANALOGIFREMGANGSMAATE TIL FREMSTILLING AV TERAPEUTISK AKTIVE BENZOCYKLOALKENYLDIHYDROKSYALKANSYREDERIVATERDerivatives of benzocycloalkenyldihydroxyalkanoic acids,... F Didier,N Jean-Yves,D Denis,... 被引量: 0发表: 1993年 FREMGANGSMAATE FOR FREMSTILLING AV CYKLOPROPAN-KARBOKSYLSYREESTER-DERIVATER...
Such a reaction yields closo-1,2-P2B10H10 and its mono- and di-chloro derivatives. Among them, 3,6-Cl2-closo-1,2-P2B10H8 (1) has been crystallized after separation from the reaction mixture. The parent phosphaborane can be thermally rearranged to obtain the isomeric closo-1,7-P2B10H10...