1,2,4-恶二唑[4,5- a ]吡啶鎓盐加成醇和醇盐进行环电开环,得到烷氧基丁二烯基1,2,4-恶二唑衍生物。吡啶鎓盐代表一类特殊的Zincke盐,当用合适的亲核试剂处理时,倾向于重排生成烷氧基丁二烯基1,2,4-恶二唑,或者在存在碳酸氢盐时生成吡啶酮。实验条件的关键调整可直接合成有价值的1,2,4-恶二唑衍生物。还根据先前的观察结果讨论了该机制。
The first example of oxidant-free cobalt-catalyzed synthesis of five-membered spirocycles is reported from benzimidates and maleimides utilizing nitrobenzene as promoter. In contrast to previously known cobalt-catalyzed oxidative C–H functionalization reactions, this transformation occurs efficiently in the absence of oxidant and is accompanied by liberation of hydrogen. The spiro-lactams were readily
The present invention relates to a novel benzenedicarboxamide derivative and the use thereof as an insecticide having the formula (I) wherein the chemical groups W
1
to W
9
, and R
1
to R
3
are as defined here-in.
Synthesis of 1<i>H</i>-Indazoles from Imidates and Nitrosobenzenes via Synergistic Rhodium/Copper Catalysis
作者:Qiang Wang、Xingwei Li
DOI:10.1021/acs.orglett.6b00727
日期:2016.5.6
Nitrosobenzenes have been used as a convenient aminating reagent for the efficient synthesis of 1H-indazoles via rhodium and copper catalyzed C–H activation and C–N/N–N coupling. The reaction occurred under redox-neutral conditions with high efficiency and functional group tolerance. Moreover, a rhodacyclic imidate complex has been identified as a key intermediate.
Compounds useful as reversible inhibitors of cysteine proteases
申请人:——
公开号:US20020058809A1
公开(公告)日:2002-05-16
Disclosed are novel cathepsin S, K, F, L and B reversible inhibitory compounds of the formulas (I), (II), (Ia) and (Ib) further defined herein. The compounds are useful for treating autoimmune diseases. Also disclosed are processes for making such novel compounds.
1
Synthesis of Highly Fused Pyrano[2,3-<i>b</i>]pyridines via Rh(III)-Catalyzed C–H Activation and Intramolecular Cascade Annulation under Room Temperature
作者:Xu Han、Feng Gao、Chunpu Li、Daqing Fang、Xiong Xie、Yu Zhou、Hong Liu
DOI:10.1021/acs.joc.9b03102
日期:2020.5.15
A facile access to the polycyclic-fused pyrano[2,3-b]pyridines has been established under room temperature via Rh(III)-catalyzed C-H bond activation and intramolecular cascade annulation. This strategy features high efficiency, unique versatility, and generality and it can occur under mild conditions in good to excellent yields. More importantly, this strategy can be extended to the late-stage functionalization