Transition‐Metal‐Free Deaminative Vinylation of Alkylamines
作者:Jiefeng Hu、Bo Cheng、Xianyu Yang、Teck‐Peng Loh
DOI:10.1002/adsc.201900576
日期:2019.11.5
reactivity is the utilization of pyridinium salt‐activated alkylamines, with a base as a promoter. The transformation exhibits good functional group compatibility, and includes inexpensive primary amine feedstocks and aminoacids. The proposed method can serve as a powerful synthetic method for late‐stage modification of complex compounds. Mechanistic experiments suggest that free radical processes are
Organophotocatalytic Radical–Polar Cross-Coupling of Styrylboronic Acids and Redox-Active Esters
作者:Allan J. B. Watson、Jeremy Brals、Nicholas D’Arcy-Evans、Thomas M. McGuire
DOI:10.1055/a-2179-6570
日期:2024.1
We report the development of a radical–polar cross-coupling reaction using styrylboronic acids and redox-active esters under organophotoredox catalysis. The reaction proceeds through a formal polarity-mismatched radical addition. The use of an organic photocatalyst permitted very low loadings of the electron-shuttle additive and accelerated reaction times compared with established processes. The scope
Design and synthesis of benzo-lipoxin A4 analogs with enhanced stability and potent anti-inflammatory properties
作者:Nicos A. Petasis、Raquel Keledjian、Yee-Ping Sun、Kalyan C. Nagulapalli、Eric Tjonahen、Rong Yang、Charles N. Serhan
DOI:10.1016/j.bmcl.2008.01.013
日期:2008.2
A new class of chemically and metabolically stable lipoxin analogs featuring a replacement of the tetraene unit of native LXA(4) with a substituted benzo-fused ring system have been designed and studied. These molecules were readily synthesized via a convergent synthetic route involving iterative palladium-mediated cross-coupling, and exhibit enhanced chemical stability, as well as resistance to metabolic inactivation via eicosanoid oxido-reductase. These new LX analogs were evaluated in a model of acute inflammation and were shown to exhibit potent anti-inflammatory properties, significantly decreasing neutrophil infiltration in vivo. The most potent among these was compound 9 (o-[9,12]-benzo-15-epi-LXA(4) methyl ester. Taken together, these findings help identify a new class of stable and easily prepared LX analogs that may serve as novel tools and as promising leads for new anti-inflammatory agents with improved therapeutic pro. le. (c) 2008 Elsevier Ltd. All rights reserved.
Stereoretentive trifluoromethylthiolation of (E)‑styrylboronic acid with AgSCF3 or N-trifluoromethylthiosuccinimide
作者:Changge Zheng、Mingyu Ma、Shuai Huang、Chao Jiang、Yang Liu、Yingying Fu、Kui Zhao、Ruilong Feng、Jianquan Hong