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
A Chemoselective Polarity‐Mismatched Photocatalytic C(sp<sup>3</sup>)−C(sp<sup>2</sup>) Cross‐Coupling Enabled by Synergistic Boron Activation**
作者:Jeremy Brals、Thomas M. McGuire、Allan J. B. Watson
DOI:10.1002/anie.202310462
日期:2023.10.16
We report a rare polarity-mismatched radical addition reactionusing styrene boronic acids and redox-active N-hydroxyphthalimide (NHPI) esters under photoredox catalysis. The reactiondisplays broad scope with mechanistic investigations supporting a unique synergistic activation pathway that displays chemoselectivity for styrene boronic acids in the presence of other SOMOphiles. SOMO=singly occupied
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
DOI:10.1016/j.tetlet.2022.153982
日期:2022.8
Mild Base Promoted Nucleophilic Substitution of Unactivated
<i>sp</i>
<sup>3</sup>
‐Carbon Electrophiles with Alkenylboronic Acids
作者:Shiwen Liu、Xiaojun Zeng、Gerald B. Hammond、Bo Xu
DOI:10.1002/adsc.201800826
日期:2018.10.4
Diverse alkenylboronic acids react smoothly with various sp3‐carbon electrophiles such as unactivated alkyl triflates in the presence of mild bases such as K3PO4. The reaction protocol is very mild and thereby enables high functional group tolerance. This transition metal‐free condition is orthogonal towards the classic transition metal catalyzed Suzuki coupling.
在温和的碱(例如K 3 PO 4)存在下,不同的烯基硼酸与各种sp 3-碳亲电试剂(例如未活化的烷基三氟甲磺酸酯)平滑反应。反应方案非常温和,因此可以实现较高的官能团耐受性。这种无过渡金属的条件与经典的过渡金属催化的Suzuki偶联正交。