Metal-Free C(sp3)–H Allylation via Aryl Carboxyl Radicals Enabled by Donor–Acceptor Complex
摘要:
The first aryl carboxyl radical generation by the donor-acceptor complex with N-acyloxyphthalimides and Hantzsch esters is reported. Regio- and chemoselective C(sp(3))-H bond allylation is enabled by aryl carboxyl radicals with visible light irradiation under mild and metal-free conditions.
MILD AND CONVENIENT ONE POT SYNTHESIS OFN-HYDROXYIMIDES FROMN-UNSUBSTITUTED IMIDES
摘要:
A new, one pot synthesis of various N-hydroxyimides from N-unsubstituted imides is described. Imides are first transformed into their N-Boc derivatives, which are next reacted with aqueous hydroxylamine, providing crystalline hydroxylammonium salts of the corresponding N-hydroxyimides. Filtration and acidic workup affords pure N-hydroxyimides.
A novel synthesis of fused perfluoroalkylated 2,3-dihydroisoxazoles is achieved via oxa-Michael-aldol annulation between perfluoroalk-2-ynoates and N-hydroxyimides. This method provides a convenient route for the synthesis of pyrrolidin-2-one-fused perfluoroalkylated 2,3-dihydroisoxazoles in yields of up to 97%. Diverse and pharmaceutically attractive polycyclic scaffolds can be obtained rapidly and
[EN] PEPTIDE-CONJUGATED PRODRUGS<br/>[FR] PROMÉDICAMENTS CONJUGUÉS À UN PEPTIDE
申请人:UNIV BRANDEIS
公开号:WO2021055690A1
公开(公告)日:2021-03-25
The present disclosure relates to a conjugated prodrug comprising a peptide conjugated to an antibiotic molecules via a cleavable linker and pharmaceutical compositions thereof. Also disclosed are methods of enhancing the intracellular concentration of an antibiotic agent in a bacterium and methods of treating a patient for a bacterial infection.
Herein, we report the first example of group transfer radical addition of O-vinylhydroxylamine derivatives onto unactivatedalkenes. By utilizing O-vinylhydroxylamine derivatives as both the N- and C-donors, this reaction enables intermolecular carboamination of unactivatedalkenes in an atom economical fashion. As the process is initiated through N-radical addition followed by C-transfer, linear carboamination
在此,我们报告了第一个将 O-乙烯基羟胺衍生物基团转移自由基加成到未活化烯烃上的例子。通过使用 O-乙烯基羟胺衍生物作为 N 和 C 供体,该反应能够以原子经济的方式对未活化的烯烃进行分子间碳胺化。由于该过程是通过 N-自由基加成和 C-转移引发的,因此提供了线性碳胺化产物。这与烯烃的经典自由基碳官能化不同,后者通常有利于支链产物,因为它是由 C-自由基加成引发的。
Photoinduced Copper‐Catalyzed Asymmetric Decarboxylative Alkynylation with Terminal Alkynes
作者:Hai‐Dong Xia、Zhong‐Liang Li、Qiang‐Shuai Gu、Xiao‐Yang Dong、Jia‐Heng Fang、Xuan‐Yi Du、Li‐Lei Wang、Xin‐Yuan Liu
DOI:10.1002/anie.202006317
日期:2020.9.21
photoinduced copper‐catalyzed asymmetric radical decarboxylative alkynylation of bench‐stable N‐hydroxyphthalimide(NHP)‐type esters of racemic alkyl carboxylic acids with terminal alkynes, which provides a flexible platform for the construction of chiral C(sp3)−C(sp) bonds. Critical to the success of this process are not only the use of the copper catalyst as a dual photo‐ and cross‐coupling catalyst but
phosphine–nickel complex and an axially chiral sodium dicarboxylate has been developed. The transformation features mild reaction conditions, a broad substrate scope, and excellent functional group tolerance, offering an efficient approach to an array of enantioenriched O-propargyl hydroxylamines. Mechanistic studies support the presumed role of the chiral carboxylate as a counterion for nickel catalysis enabling
已经开发了通过结合膦-镍络合物和轴向手性二羧酸钠催化的高度对映选择性的 O-炔丙基化。该转化具有温和的反应条件、广泛的底物范围和出色的官能团耐受性,为一系列富含对映体的O-炔丙基羟胺提供了一种有效的方法。机理研究支持手性羧酸盐作为镍催化的抗衡离子的假定作用,从而能够发现高度立体选择性的转化。该反应的威力通过其在强效萤火虫萤光素酶抑制剂和 ( S )-二氢yashabushiketol 的不对称全合成中的应用来说明。