Palladium-Catalyzed C–P Bond-Forming Reactions of Aryl Nonaflates Accelerated by Iodide
作者:Holly McErlain、Leanne M. Riley、Andrew Sutherland
DOI:10.1021/acs.joc.1c02172
日期:2021.12.3
iodide-accelerated, palladium-catalyzed C–P bond-forming reaction of aryl nonaflates is described. The protocol was optimized for the synthesis of aryl phosphine oxides and was found to be tolerant of a wide range of aryl nonaflates. The general nature of this transformation was established with coupling to other P(O)H compounds for the synthesis of aryl phosphonates and an aryl phosphinate. The straightforward
Reactions of Arylsulfonate Electrophiles with NMe<sub>4</sub>F: Mechanistic Insight, Reactivity, and Scope
作者:Sydonie D. Schimler、Robert D. J. Froese、Douglas C. Bland、Melanie S. Sanford
DOI:10.1021/acs.joc.8b01762
日期:2018.9.21
fluorosulfonates with tetramethylammonium fluoride (NMe4F) and ultimately identifies other sulfonate electrophiles that participate in this transformation. 19F NMR spectroscopic monitoring of the deoxyfluorination of aryl fluorosulfonates revealed the rapid formation of diaryl sulfates under the reaction conditions. These intermediates can proceed to fluorinated products; however, diaryl sulfate derivatives
本文介绍了对芳基氟磺酸盐与四甲基氟化铵(NMe 4 F)进行脱氧氟化的详细研究,并最终确定了参与该转化的其他磺酸盐亲电体。芳基氟磺酸盐的脱氧氟化的19 F NMR光谱监测显示,在反应条件下迅速形成了硫酸二芳基酯。这些中间体可以继续生成氟化产物。然而,带有给电子取代基的硫酸二芳基酯衍生物与NMe 4的反应非常缓慢F.基于这些发现,研究了三氟甲磺酸芳基酯和壬二酸芳基酯衍生物,因为它们不能反应形成硫酸二芳基酯。发现芳基三氟甲磺酸酯是用NMe 4 F脱氧氟化特别有效的亲电子试剂,某些衍生物(即带有电子中性/给体取代基的衍生物)提供的收率高于其芳基氟磺酸酯对应物。计算研究暗示了所有磺酸亲电子试剂的脱氧氟化的相似机理。
Highly stereoselective and catalytic desulfitative C O and C I dienylation with sulfolenes: The importance of basic additives
作者:Hang T. Dang、Viet D. Nguyen、Hoang H. Pham、Hadi D. Arman、Oleg V. Larionov
DOI:10.1016/j.tet.2019.04.012
日期:2019.6
organic synthesis and materials science. We describe herein a palladium-catalyzeddienylation of aryl, heteroaryl, and vinyl triflates, nonaflates and iodides that were previously identified as recalcitrant substrates for the sulfolene-mediated catalytic dienylation. The method has now been successfully expanded to C-O and C-I dienylation, demonstrating broad scope with respect to sulfonates, iodides
One‐Pot Generation of Benzynes from Phenols: Formation of Primary Anilines by the Deoxyamination of Phenols
作者:Takashi Ikawa、Shigeaki Masuda、Shuji Akai
DOI:10.1002/chem.201904987
日期:2020.4
were selectively generated in-situ fromphenols and trapped regioselectively by potassium hexamethyldisilazide to form primary anilines following acidic workup. The direct conversion of a phenolic hydroxyl group to a free amino group is a useful method for the preparation of primary aryl amines that are hard to synthesize using coupling reactions involving phenol derivatives with ammonia. While reactions
<i>Z</i>-Selective Dienylation Enables Stereodivergent Construction of Dienes and Unravels a Ligand-Driven Mechanistic Dichotomy
作者:Hang T. Dang、Viet D. Nguyen、Graham C. Haug、Ngan T. H. Vuong、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.0c05574
日期:2021.2.5
bonds because it allows for control of stereoselectivity and efficiency of formation of each double bond. A conceptually distinct dienylation approach entails a stereoselective appendage of a four-carbon unit, shortcutting diene synthesis. Dienylation with sulfolene provided a direct route to E-dienes, but the synthesis of substantially more challenging Z-dienes remained elusive. Here, we report that