描述了基于在硫原子上被芳基或烷基自由基的分子内均质取代(S H i)合成环状亚磺酸酯和亚磺酰胺的通用且有效的方法。烷基和苯并稠合的化合物都可以直接从容易制备的无环前体中获得。对映体富集的硫基杂环是通过S H i过程形成的,硫原子上的构型反转。前手性自由基的环化进行的立体化学结果各不相同,具体取决于传入自由基的大小。2-吡啶基和2-喹啉基会生成联芳基化合物,这是由于攻击芳基亚磺酸盐的邻位而不是亲硫取代引起的。
Metal complexes derivatized with folate for use in diagnostic and
申请人:Bracco Research USA Inc.
公开号:US06093382A1
公开(公告)日:2000-07-25
Diagnostic and therapeutic compositions in the form of complexes for enhancing transmembrane transport of a diagnostic or therapeutic agent and methods for their use. The complexes contain the .alpha., .gamma., or bis isomers of folate receptor-binding analogs of folate, a metal chelated by a ligand, and in one embodiment, a chemotherapeutic agent.
Chemoselective Electrosynthesis Using Rapid Alternating Polarity
作者:Yu Kawamata、Kyohei Hayashi、Ethan Carlson、Shobin Shaji、Dirk Waldmann、Bryan J. Simmons、Jacob T. Edwards、Christoph W. Zapf、Masato Saito、Phil S. Baran
DOI:10.1021/jacs.1c06572
日期:2021.10.13
in the selective manipulation of functional groups (chemoselectivity) in organic synthesis have historically been overcome either by using reagents/catalysts that tunably interact with a substrate or through modification to shield undesired sites of reactivity (protecting groups). Although electrochemistry offers precise redox control to achieve unique chemoselectivity, this approach often becomes challenging
Ni-Catalyzed Reductive Coupling of Alkyl Acids with Unactivated <i>Tertiary</i> Alkyl and Glycosyl Halides
作者:Chenglong Zhao、Xiao Jia、Xuan Wang、Hegui Gong
DOI:10.1021/ja510653n
日期:2014.12.17
highlights Ni-catalyzed reductivecoupling of alkyl acids with alkyl halides, particularly sterically hindered unactivated tertiary alkyl bromides for the production of all carbon quaternary ketones. The reductive strategy is applicable to α-selective synthesis of saturated, fully oxygenated C-acyl glycosides through easy manipulations of the readily available sugar bromides and alkyl acids, avoiding otherwise
Amide-Group-Directed Protonolysis of Cyclopropane: An Approach to 2,2-Disubstituted Pyrrolidines
作者:Marija Skvorcova、Aigars Jirgensons
DOI:10.1021/acs.orglett.7b00584
日期:2017.5.19
Regioselective protonolytic C–C bond cleavage of acylated aminomethyl cyclopropanes can be achieved using trifluoroacetic acid. The intermediate tertiary carbenium ion undergoes an intramolecular amination to give 2,2-substituted pyrrolidines. The strength of the acid and the amine substituent are important factors to achieve high regioselectivity, suggesting intramolecular proton transfer from the
Metal complexes derivatized with folate for use in diagnostic and therapeutic applications
申请人:——
公开号:US20010004454A1
公开(公告)日:2001-06-21
Diagnostic and therapeutic compositions in the form of complexes for enhancing transmembrane transport of a diagnostic or therapeutic agent and methods for their use. The complexes contain the &agr;, &ggr;, or bis isomers of folate receptor-binding analogs of folate, a metal chelated by a ligand, and in one embodiment, a chemotherapeutic agent.