SILICON BASED DRUG CONJUGATES AND METHODS OF USING SAME
申请人:BlinkBio, Inc.
公开号:US20170202970A1
公开(公告)日:2017-07-20
Described herein are silicon based conjugates capable of delivering one or more payload moieties to a target cell or tissue. Contemplated conjugates may include a silicon-heteroatom core, one or more optional catalytic moieties, a targeting moiety that permits accumulation of the conjugate within a target cell or tissue, one or more payload moieties (e.g., a therapeutic agent or imaging agent), and two or more non-interfering moieties covalently bound to the silicon-heteroatom core.
Herein, we report the development of a tailored cobalt catalyst system of Cp*Co(III)(LX) toward intramolecular C-H nitrene insertion of azidoformates to afford cyclic carbamates. The cobalt complexes were easy to prepare and bench-stable, thus offering a convenient reaction protocol. The catalytic reactivity was significantly improved by the electronic tuning of the bidentate LX ligands, and the observed
Rhodium(II)-Catalyzed Undirected and Selective C(sp<sup>2</sup>)–H Amination en Route to Benzoxazolones
作者:Ritesh Singh、Kommu Nagesh、Matam Parameshwar
DOI:10.1021/acscatal.6b02237
日期:2016.10.7
promote the activation and cyclization of arylcarbamate substrates to yield benzoxazolones via an intramolecular nitrene C–H insertion reaction. Investigation of the substrate scope shows that the reaction undergoes selective aromatic C(sp2)—H amination over more labile o-C(sp3)—Hbonds. Observation of inverse secondary KIE (PH/PD = 0.42 ± 0.03) indicates involvement of aromatic electrophilic substitution
铑(II)可以通过分子内的氮杂C–H插入反应有效地促进芳基氨基甲酸酯底物的活化和环化,从而生成苯并恶唑啉酮。对底物范围的研究表明,该反应在更不稳定的o -C(sp 3)-H键上进行了选择性芳族C(sp 2)-H胺化反应。反向二次KIE的观察结果(P H / P D = 0.42±0.03)表明,芳族亲电取代机理参与了芳基CH酰胺化反应。
Iron-Catalyzed Arene C–H Amidation Using Functionalized Hydroxyl Amines at Room Temperature
作者:A. V. G. Prasanthi、Samiyara Begum、Hemant Kumar Srivastava、Sandip Kumar Tiwari、Ritesh Singh
DOI:10.1021/acscatal.8b02939
日期:2018.9.7
Herein, we report Fe(III)(TPP)Cl as an effective catalyst for promoting arene C–H amidation throughintramolecular cyclization of N-tosyloxyarylcarbamate substrates. The reaction proceeds via nitrene (outer sphere pathway) C(sp2)–H insertion to yield benzoxazolones under external-oxidant-free conditions at ambient temperature. The method is operationally simple and scalable with high-functional-group