The Stereochemistry of Organometallic Compounds. XLII. The Preparation of [2,1-b]Quinazolines Involving Rhodium-Catalysed Hydroformylation of 2-Amino-N-Alkenylbenzylamines
四氢-1,5-苯并reaction庚因和四氢-1 H -1,5-苯并二氮杂通过串联还原-还原胺化反应
摘要:
串联还原-还原胺化反应已用于合成(±)-4-烷基-2,3,4,5-四氢-1,5-苯并x氮平和(±)-4-烷基-1-苯甲酰基- 2,3,4,5-四氢-1 H -1,5-苯并二氮杂s。通过用2-氟-1-硝基苯将几种3-丁烯-1-醇衍生物中的醇盐进行亲核芳族取代,然后进行臭氧分解,可制备1,5-苯并x杂庚环闭环所需的硝基醛和酮。1,5-苯并二氮杂卓的前体是通过类似地添加N来制备的-(3-丁烯基)苯甲酰胺阴离子生成2-氟-1-硝基苯,然后进行臭氧分解。然后使用5%钯碳的甲醇溶液催化硝基羰基化合物的加氢反应,然后通过串联还原-还原胺化顺序得到目标杂环。色谱纯化后,高产率地分离出1,5-苯并x氮平。直接从氢化混合物中分离出固体形式的1,5-苯并二氮杂并在两个氮原子上具有不同的官能度。
Chemo- and Site-Selective Alkyl and Aryl Azide Reductions with Heterogeneous Nanoparticle Catalysts
作者:Venkatareddy Udumula、S. Hadi Nazari、Scott R. Burt、Madher N. Alfindee、David J. Michaelis
DOI:10.1021/acscatal.6b01217
日期:2016.7.1
to generating new leads for drug discovery. Herein, we show that heterogeneous nanoparticle catalysts enable site-selective monoreduction of polyazide substrates for the generation of aminoglycoside antibiotic derivatives. The nanoparticle catalysts are highly chemoselective for reduction of alkyl and aryl azides under mild conditions and in the presence of a variety of easily reduced functional groups
Copper-Catalyzed Divergent Trifluoromethylation/Cyclization of Unactivated Alkenes
作者:Jing Zheng、Ziyang Deng、Yan Zhang、Sunliang Cui
DOI:10.1002/adsc.201500965
日期:2016.3.3
Most of the precedent copper‐catalyzed trifluoromethylation reactions of unactivatedalkenes concern terminalalkenes, and these processes are terminated in elimination, or nucleophilic addition, or semipinacol rearrangement, or CH bond functionalization steps. In this study, we develop a trifluoromethylation method for both unactivatedterminal and internal alkenes to enable divergent late‐stage
Efficient synthesis of SCF<sub>3</sub>-substituted tryptanthrins by a radical tandem cyclization
作者:Jincheng Guo、Yanan Hao、Gang Li、Ziwen Wang、Yuxiu Liu、Yongqiang Li、Qingmin Wang
DOI:10.1039/d0ob00233j
日期:——
we report a new, efficient and atom-economical strategy for the synthesis of SCF3-substituted tryptanthrin derivatives. These previously unreported derivatives were obtained by means of a radical tandem cyclization. The reaction was triggered by addition of a SCF3 radical to a carbon-carbon double bond and involved the formation of a C(sp3)-SCF3 bond, a C(sp2)-C bond, and a C(sp2)-N bond. This method
Small-Ring Compounds. XXXIV. Carbonium Ion Reactions of 1-Methylcyclobutyl, (1-Methylcyclopropyl)-carbinyl and (β-Methylallyl)-carbinyl Derivatives<sup>1</sup>
作者:Eugene F. Cox、Marjorie C. Caserio、Marc S. Silver、John D. Roberts
DOI:10.1021/ja01473a028
日期:1961.6
alcohol as the only cyclic product. About 3% of the ^(14)C content of 1-methylcyclobutanol from the deamination of (1-methylcyclopropyl)-carbynil-α-^(14)C)-amine was found at the 3-position. These results are interpretable in terms of classical carboniumions and/or substituted “bicyclobutonium” ion intermediates with fairly localized positive charges.
Tandem Dipolar Cycloaddition−Mannich Cyclization as an Approach to Tricyclic Nitrogen Heterocycles
作者:Albert Padwa、Michael A. Brodney、Joseph P. Marino、Martin H. Osterhout、Alan T. Price
DOI:10.1021/jo9607267
日期:1997.1.1
stereochemistry of the resulting A/B ring fusion is analogous to similar erythrinane products obtained via a Mondon-enamide-type cyclization. The stereochemical assignment of the final cyclized products was determined by X-ray crystallography. Molecularmechanicscalculations show that the ground state energy of the cis-fused diastereomer is 4.6 kcal lower than that of the trans diastereomer, and presumably some