Electrophilic <i>N</i>-Amination of Two Quinazoline-2,4-diones Using Substituted (Nitrophenyl)hydroxylamines
作者:David C. Boyles、Timothy T. Curran、Parlett、Mark Davis、Frank Mauro
DOI:10.1021/op010239f
日期:2002.5.1
The preparation of a few (nitrophenyl)hydroxylamines and reaction with two quinazoline-2,4-diones is described. The electrophilic aminating agents were assessed in terms of yield for the N-amination of two quinazoline-2,4-diones and safety considerations for rapid scale-up. For the amination of the described system, the best yield and the highest onset temperature were found in the same aminating agent
DERIVATIVES OF 6,7-DIHYDRO-3H-OXAZOLO[3,4-a]PYRAZINE-5,8-DIONE
申请人:SACURAI Sérgio Luiz
公开号:US20120040988A1
公开(公告)日:2012-02-16
The present invention describes a series of derivatives of 6,7-dihydro-3H-oxazolo[3,4-a]pyrazine-5,8-dione, mixtures thereof, their pharmaceutically acceptable salts, which are inhibitors of PDE-5, possessing vasodilatator properties and relaxing effects. In particular, the derivative (R)-3-(1,3-benzodioxol-5-yl)-1-(1H-indol-3-yl)-7-methyl-6,7-dihydro[1,3]oxazolo[3,4-a]pyrazine-5,8-dione, its enantiomer (S)-3-(1,3-benzodioxol-5-yl)-
1
-(1H-indol-3-yl)-7-methyl-6,7-dihydro[1,3]oxazolo[3,4-a]pyrazine-5,8-dione.
The present invention describes, additionally, processes for the preparation of said compounds, pharmaceutical compositions containing them, thereof, as well as uses as inhibitors of the enzyme phosphodiesterase type 5 (PDE-5) in the treatment of the erectile dysfunction and PDE-5 inhibitor treatable disorders.
Diastereoselective Radical Aminoacylation of Olefins through N-Heterocyclic Carbene Catalysis
作者:Wen-Deng Liu、Woojin Lee、Hanyu Shu、Chuyu Xiao、Huiwei Xu、Xiangyang Chen、Kendall N. Houk、Jiannan Zhao
DOI:10.1021/jacs.2c11209
日期:2022.12.14
There have been significant advancements in radical-mediated reactions through covalent-based organocatalysis. Here, we present the generation of iminyl and amidyl radicals via N-heterocyclic carbene (NHC) catalysis, enabling diastereoselective aminoacylation of trisubstituted alkenes. Different from photoredox catalysis, single electron transfer from the deprotonated Breslow intermediate to O-aryl
Net-1,2-Hydrogen Atom Transfer of Amidyl Radicals: Toward the Synthesis of 1,2-Diamine Derivatives
作者:Yonggang Jiang、Dongxiang Liu、Madeline E. Rotella、Guogang Deng、Zhengfen Liu、Wen Chen、Hongbin Zhang、Marisa C. Kozlowski、Patrick J. Walsh、Xiaodong Yang
DOI:10.1021/jacs.3c04376
日期:2023.7.26
Beginning with singleelectrontransferfrom 2-azaallyl anions to N-alkyl N-aryloxy amides, the latter generate amidylradicals. The amidylradical undergoes a net-1,2-HAT to generate a C-centered radical that participates in an intermolecular radical–radical coupling with the 2-azaallyl radical to generate 1,2-diamine derivatives. Mechanistic and EPR experiments point to radical intermediates. Density
Penam derivatives for treating bacterial infections
申请人:TenNor Therapeutics Limited
公开号:US11040987B2
公开(公告)日:2021-06-22
Novel iron chelating group conjugated penam derivatives described herein show antibacterial activity, and could be used as antibacterial agents or beta-lactamase inhibitors (BLIs) which are of value for application in combination with other antibacterial agents.