an alkyl- lithium to 1-phenylthio-1-trimethylsilylethene (7), and transmetallation of a tributylstannyl moiety. The formation of an alkyl-lithium by reaction of lithium naphthalenide with a phenyl sulphide provided an additional route to (2) from bis(phenylthio)acetals (8). An alternative path to the α-phenylthiosilanes (2) was to reduce the corresponding α-phenylsulphonylsilane (15); these, in turn
ANTHRACYCLINE DERIVATIVE CONJUGATES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS ANTITUMOR COMPOUNDS
申请人:Beria Italo
公开号:US20100034837A1
公开(公告)日:2010-02-11
The present invention relates to conjugates of therapeutically useful anthracyclines with carriers such as polyclonal and monoclonal antibodies, proteins or peptides of natural or synthetic origin; methods for their preparation, pharmaceutical composition containing them and use thereof in treating certain mammalian tumors.
Certain sulfonamide heterobicyclic platelet activating factor antagonists
申请人:British Bio-Technology Limited
公开号:US05180723A1
公开(公告)日:1993-01-19
Compounds of general formula I; ##STR1## wherein: A.sup.1 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.1 --; A.sup.2 is .dbd.N--, .dbd.CH-- or .dbd.CR.sup.2 --; provided that, when one of A.sup.1 and A.sup.2 is a nitrogen atom, the other of A.sup.1 and A.sup.2 is other than a nitrogen atom; wherein the other variables are as defined in the specification and their pharmaceutically and veterinarily acceptable acid addition salts and hydrates are antagonists of platelet activating factor (PAF) and as such are useful in the treatment or amelioration of various diseases or disorders mediated by PAF.
Ligand-Enabled γ-C(sp<sup>3</sup>)–H Activation of Ketones
作者:Ru-Yi Zhu、Zi-Qi Li、Han Seul Park、Chris H. Senanayake、Jin-Quan Yu
DOI:10.1021/jacs.8b01359
日期:2018.3.14
are identified to enable C(sp3)-H activation for the first time. A rare six-membered palladacycle intermediate is isolated and characterized to elucidate the reaction mechanism. Both (hetero)arylation and vinylation of γ-C(sp3)-H bonds are demonstrated. Sequential β- and γ-C(sp3)-H (hetero)arylation of muscone showcases the utility of this method for late-stagediversification. A convenient Mn(II)-catalyzed
Aerobic oxidative iodination of organic molecules activated by sodium nitrite
作者:Jernej Iskra、Stojan Stavber、Marko Zupan
DOI:10.1016/j.tetlet.2007.11.167
日期:2008.1
Aerobic oxidative iodination activated by sodium nitrite occurs effectively and selectively with 100% iodine atom economy with air as the oxidant. Silica-supported sulfuric acid was used for the activation of the catalyst and iodination. Thus, I2/NaNO2/air/silica-supported H2SO4 in acetonitrile iodinated aromatics, ketones and aldehydes effectively at ambient temperature.
亚硝酸钠活化的好氧氧化碘有效地,选择性地发生,以100%的碘原子经济性,以空气为氧化剂。二氧化硅负载的硫酸用于催化剂的活化和碘化。因此,在环境温度下,I 2 / NaNO 2 /空气/二氧化硅负载的H 2 SO 4在乙腈碘化的芳族化合物,酮和醛中有效。