描述了类似物1(CC-1065)及其与抗体的结合物的磷酸盐前药的合成和生物学评估。1,2,9,9a-四氢环丙烷[ c ]苯并[ e化合物的] indol-4-one(CBI)部分赋予其在水溶液中增强的溶解度和稳定性。在磷酸酶存在下,这些化合物转化为活性DNA烷基化剂。通过将CBI与双吲哚基部分偶合,然后连接含硫醇的连接基,并将CBI的羟基转化为磷酸酯前药,依次实现前药的合成。结合到前药中的接头使得在含有少至5%有机助溶剂的水性缓冲溶液中,可以通过稳定的二硫键或硫醚键与抗体偶联,从而产生单体和稳定的抗体-细胞毒性前药偶联物。在抗体缀合物中使用了两个在空间位阻上不同的含二硫键的接头,以测试不同速率的细胞内二硫键裂解和效应物释放对生物活性的影响。前药可通过内源磷酸酶的作用转化为活性细胞毒性化合物。抗体-前药结合物在体外和体内均显示出有效的抗原选择性细胞毒活性。
Synthesis of biaryls via intramolecular free radical ipso-substitution reactions
作者:Feroze Ujjainwalla、Maria Lucília E.N. da Mata、Andrew M.K. Pennell、Carmen Escolano、William B. Motherwell、Santiago Vázquez
DOI:10.1016/j.tet.2015.07.048
日期:2015.9
intramolecular freeradical [1,5]-ipso-substitution using sulfonamide and sulfonate derived tethering chains. The overall efficiency of the process is determined by appropriately positioned substituents on the aromatic acceptor ring. The extension of the process to benzylic sulfonates and their corresponding N-methylsulfonamide alternatives as substrates in potential [1,6]-ipso-substitution reactions leads
Rhodium-Catalyzed <i>ortho</i>-Selective Carbene C–H Insertion of Unprotected Phenols Directed by a Transient Oxonium Ylide Intermediate
作者:Rui-Ting Guo、Ya-Lin Zhang、Jun-Jie Tian、Ke-Yu Zhu、Xiao-Chen Wang
DOI:10.1021/acs.orglett.9b04452
日期:2020.2.7
ortho-Selective carbene C-H insertion of unprotected phenols is achieved with dimethyldiazomalonate under the catalysis of [Rh(COD)Cl]2. After the C-H insertion, subsequent cyclization and electrophilic addition of another carbene molecule affords tris-carboxylate-substituted 2-benzofuranones as the final reaction products. The enantioselective variant has been developed with the use of chiral diene
Chromium- and Tungsten-Triggered Valence Isomerism of <i>cis</i>-1-Acyl-2-ethynylcyclopropanes via [3,3]Sigmatropy of (2-Acylcyclopropyl)vinylidene−Metal Intermediates
The reaction of cis vicinal acetylethynylcyclopropanes 1 with a catalytic amount of M(CO)5(THF) (M = Cr or W) in the presence of Et3N at room temperature gave ortho-substituted phenols 7 in good yields as valence isomerized products. In the absence of Et3N the reactions did not work at all. The reaction of a cyclopropane having an ester or an amide instead of an acetyl moiety with M(CO)5(THF) did not
Dioxygenase-catalysed oxidation of monosubstituted thiophenes: sulfoxidation versus dihydrodiol formation
作者:Derek R. Boyd、Narain D. Sharma、Nimal Gunaratne、Simon A. Haughey、Martina A. Kennedy、John F. Malone、Christopher C. R. Allen、Howard Dalton
DOI:10.1039/b300867n
日期:2003.3.13
unstable thiophene oxide metabolites, 6A-6G, 6K-6N, spontaneously dimerised yielding the corresponding racemic disulfoxide cycloadducts 7A-7G, 7K-7N. Dimeric or crossed [4 + 2] cycloaddition products, derived from the thiophene oxide intermediates 6A and 6D or 6B and 6D, were found when mixtures of thiophene substrates 1A and 1D or 1B and 1D were biotransformed. The thiophene sulfoxide metabolite 6B was
Palladium-catalyzed oxidative carbonylation of 2-arylphenols throughC-H bond activation and C-C and C-O bond formation under acid-base free and mild conditions has been developed. The reaction tolerates a variety of substrates and provides biologically important benzopyranone derivatives in up to 87% isolated yield.