A novel process for the amidation or esterification which comprises reacting a compound having a carboxy group with a compound having an amino or imino group which can be acylated or with a compound having a hydroxy group in the presence of a sulfonic acid ester of the formula: R.sub.1 --SO.sub.2 --OR.sub.2 wherein R.sub.1 is an organic group and R.sub.2 O-- is a residue of a strongly acidic N-hydroxy compound as a condensation agent, and a novel sulfonic acid ester useful as such a condensation agent and a process for the preparation thereof.
Electrochemically induced oxidative S–O coupling: synthesis of sulfonates from sulfonyl hydrazides and <i>N</i>-hydroxyimides or <i>N</i>-hydroxybenzotriazoles
作者:Alexander O. Terent'ev、Olga M. Mulina、Vadim D. Parshin、Vladimir A. Kokorekin、Gennady I. Nikishin
DOI:10.1039/c8ob03162b
日期:——
oxidation of the starting compounds to form a coupling product. The developed strategy represents a quite atom-efficient approach: one partner loses two nitrogen and three hydrogen atoms, while another one loses only one hydrogen atom. Cyclic voltammetry and the control experiment allowed us to propose possible reaction pathways: generated through anodic oxidation molecular bromine or its higher oxidation
开发了在电流作用下的氧化S-O偶联过程。芳基,杂芳基和烷基磺酰基酰肼和Ñ羟基化合物(Ñ -hydroxyimides和Ñ -hydroxybenzotriazoles)应用于作为起始试剂磺酸盐的制备。该反应在恒定电流条件下在实验方便的配有石墨阳极和不锈钢阴极的不分隔电化学电池中在高电流密度(60 mA cm -2)下进行。NH 4在此过程中,Br充当支撑电解质,并参与起始化合物的氧化,以形成偶联产物。制定的策略代表了一种相当有效的原子效率方法:一个配偶体损失两个氮原子和三个氢原子,而另一个伙伴仅损失一个氢原子。循环伏安法和对照实验使我们能够提出可能的反应途径:通过阳极氧化分子溴或其较高氧化态衍生物产生的氧化途径将起始化合物氧化而形成反应性物种,然后形成S-O键。
One-pot efficient synthesis of N α-urethane-protected β- and γ-amino acids
1-[(4-Methylphenyl)oxy]pyrrolidine-2,5-dione and 1-[(4-methylphenyl)oxy]piperidine-2,6-dione react in a Lossen-type reaction with primary alcohols in the presence of triethylamine to furnish corresponding N (alpha)-urethane-protected beta-alanine and gamma-aminopropionic acid (GABA), respectively, with excellent yields and purities, in an essentially "one-pot" procedure.
IMAI YOSHIO; UEDA MITSURU; ISHIMORI MOTOKAZU, NIXON KAGAKU KAJSI, NIRRON KAGAKU KAISNI, J. CHEM. SOS. JAR., CHEM. AND I+
作者:IMAI YOSHIO、 UEDA MITSURU、 ISHIMORI MOTOKAZU
DOI:——
日期:——
Development of succinimide-based inhibitors for the mitochondrial rhomboid protease PARL
作者:William H. Parsons、Nicholas T. Rutland、Jennifer A. Crainic、Joaquin M. Cardozo、Alyssa S. Chow、Charlotte L. Andrews、Brendan K. Sheehan
DOI:10.1016/j.bmcl.2021.128290
日期:2021.10
conduct a targeted screen for small-molecule inhibitors of the mitochondrial rhomboid proteasePARL, which plays a critical role in regulating mitophagy and cell death. We synthesized a series of succinimide-containing sulfonyl esters and sulfonamides and discovered that these compounds serve as inhibitors of PARL with the most potent sulfonamides having submicromolar affinity for the enzyme. A counterscreen