Biocompatible Photoinduced Alkylation of Dehydroalanine for the Synthesis of Unnatural α-Amino Acids
作者:José A. C. Delgado、José T. M. Correia、Emanuele F. Pissinati、Márcio W. Paixão
DOI:10.1021/acs.orglett.1c01781
日期:2021.7.2
A site-selective alkylation of dehydroalanine to access protected unnatural amino acids is described. The protocol is characterized by the wide nature of alkyl radicals employed, mild conditions, and functional group compatibility. This protocol is further extended to access peptides, late-stage functionalization of pharmaceuticals, and enantioenriched amino acids.
Reactions of 2-acyloxyisobutyryl halides with nucleosides. 6. Synthesis and biological evaluation of some 3'-acyl derivatives of 2,2'-anhydro-1-(.beta.-D-arabinofuranosyl)cytosine hydrochloride
作者:Ernest K. Hamamura、Miroslav Prystasz、Julien P. H. Verheyden、John G. Moffatt、Kenji Yamaguchi、Naomi Uchida、Kosaburo Sato、Akio Nomura、Osamu Shiratori
DOI:10.1021/jm00227a016
日期:1976.5
The reactions of cytidine with 22 different 2-O-acyloxyisobutyril chlorides lead to the isolation of the corresponding 2,2'-anhydro-1-(3'-O-acyl-beta-d-arabinofuranosyl)cytosine hydrochlorides 9. These compounds, which all show cytotoxicity against HeLa cells in tissue culture, have been examined for antiviral and antileukemic activity. Activity against DNA viruses (vaccinia and Herpes) in tissue culture
Problem to be solved. There is a need for a new antibiotic having a novel mechanism of action, which exhibits strong antibacterial activity not only against sensitive bacteria, but also against resistant bacteria thereof, and at the same time possess excellent solubility and safety profile amenable to human use. Solution to the Problem. As a result of intensive research, the present inventors have found that a compound represented by general formula (I), a stereoisomer, or a pharmaceutically acceptable salt thereof inhibits DNA gyrase GyrB subunit and/or topoisomerase IV ParE subunit, possess excellent solubility and safety profile for use in human for the treatment of bacterial infectious diseases.
Photo‐triggered Intramolecular Radical Tandem Regioselective Alkylation/Cyclization of 1,
<scp>6‐Dienes</scp>
with
<scp>Redox‐Active</scp>
Esters Enabled by an
<scp>EDA</scp>
Complex
作者:Bin Sun、Lan Ling、Xiaohui Zhuang、Lulu Yang、Jieli Yin、Can Jin
DOI:10.1002/cjoc.202200516
日期:2023.1
radical tandem alkylation/cyclization between 1,6-dienes and redox-active esters has been developed, affording a series of N-aryl pyrrolidine-2-ones in moderate to good yields. The transformation is driven by the formation of an electron-donor-acceptor (EDA) complex and a subsequent single electron transfer (SET) process. This photocatalyst-free protocol features excellent regioselectivity, mild conditions
Radical Decarboxylative Cyanomethylation of Aliphatic Carboxylic Acids and Uronic Acids via Vinyl Azide Cascade Fragmentation
作者:Linhua Xu、Qishuai Li、Dongwei Li、Xin Zhou、Ni Song、Peng Wang、Ming Li
DOI:10.1002/cjoc.202200732
日期:——
A direct oxidative radical decarboxylative cyanomethylation of carboxylic acids is described using 3-azido-2-methylbut-3-en-2-ol as the carbon-centered radical acceptor. The transformation is applicable to structurally diverse α-amino acids, α-oxy acids, α-keto acids, pentofuranuronic acids, and hexopyranuronic acids. The mechanistic investigations suggest that a radical process is involved in the