Oxoammonium Salt‐Mediated Vicinal Oxyazidation of Alkenes with NaN
3
: Access to
β
‐Aminooxy Azides
摘要:
AbstractAn approach to the vicinal oxyazidation of alkenes has been achieved under mild and transition metal‐free conditions. This method utilizes NaN3 as the azidation agent and 2,2,6,6‐tetramethylpiperidine‐1‐oxoammonium tetrafluoroborate (TEMPO+BF4−) as the single‐electron oxidant as well as the oxygen source. By using this protocol, various β‐aminooxy azides were synthesized and several complex bioactive molecules were functionalized.magnified image
Asymmetric Alkyl and Aryl/Azolation of Alkenes via a Single Cu(I) Complex
作者:Xiaodong Ma、Guozhu Zhang
DOI:10.1021/acscatal.0c05576
日期:2021.5.7
The copper-catalyzed, highly enantioselective alkyl and aryl/azolation of alkenes is reported. The employment of the chiral carbazole-based bisoxazoline (Cbzbox) ligand is critical to the success of this chemistry. Anionic tridentate ligands improve the reducibility of copper complexes, facilitating alkyl/aryl radical generation and providing good enantiocontrol in the azolation. The three-component
作者:Haitao Qin、Wangshui Cai、Shuang Wang、Ting Guo、Guigen Li、Hongjian Lu
DOI:10.1002/anie.202107356
日期:2021.9.13
Examples are provided of deletion of nitrogen from natural products, synthesis of chiral O-heterocycles from commercially available chiral β-aminoalcohols, formal inert C−H functionalization through a sequence of N-directed C−H functionalization and N-atom deletion reactions in which the N-atom can serve as a traceless directing group.
切除仲胺中的氮并将两个残留片段偶联起来是一种骨架编辑策略,可用于构建具有新骨架的分子,但在很大程度上尚未被探索。在这里,我们报告了一种从 N-杂环中切除 N-原子的通用方法。该过程使用容易获得的 N-杂环作为底物,并通过 N-磺酰叠氮作用进行,然后氨磺酰叠氮化物中间体的重排,提供各种环状产物。提供了从天然产物中删除氮、从市售手性 β-氨基醇合成手性 O-杂环、通过一系列 N 导向的 CH 官能化和 N 原子缺失反应的形式惰性 CH 官能化的例子其中 N 原子可以作为一个无痕导向群。
Palladium-Catalyzed Cross-Coupling Reaction of Secondary Benzylic Bromides with Grignard Reagents
作者:Ana López-Pérez、Javier Adrio、Juan C. Carretero
DOI:10.1021/ol902335c
日期:2009.12.3
A mild palladium-catalyzed Kumada−Corriu reaction of secondary benzylic bromides with aryl and alkenyl Grignardreagents has been developed. In the presence of the Xantphos ligand, the undesired β-elimination pathway is minimized, affording the corresponding cross-coupling products in acceptable to good yields. The reaction proceeds with inversion of the configuration.
Inter- and Intramolecular Palladium-Catalyzed Allyl Cross-Coupling Reactions Using Allylindium Generated In Situ from Allyl Acetates, Indium, and Indium Trichloride
作者:Dong Seomoon、Kooyeon Lee、Hyunseok Kim、Phil Ho Lee
DOI:10.1002/chem.200601338
日期:2007.6.15
coupling partners in Pd-catalyzed cross-couplingreactions. A variety of allyl acetates such as but-1-en-3-yl acetate, crotyl acetate, and 2-methylallyl acetate afforded the corresponding allylic compounds in good yields in cross-couplingreactions. Various electrophilic cross-coupling partners such as aryl iodides and vinyl bromides and triflates participate in these reactions. Not only intermolecular but
Nickel Catalyzed Hydrovinylation of Arylethylenes: General Method of Synthesis of α-Arylpropionic Acids Intermediates
作者:Viviane Fassina、Carolina Ramminger、Marcus Seferin、Adriano L Monteiro
DOI:10.1016/s0040-4020(00)00668-2
日期:2000.9
The hydrovinylation of arylethylenes catalyzed by [Ni(MeCN)6][BF4]2/AlEt2Cl/PPh3 was modulated to obtain 3-aryl-1-butenes in high yields and selectivities. A wide variety of arylethylenes containing electron-donating or electron-withdrawing groups and Lewis basic group, can be hydrovinylated at room temperature and under mild conditions by changing the relative ratios of the three-component catalyst