Efficient C–N and C–Ocouplingreactions of aryl halides with amines and alcohols have been developed by using the strategy of heterogeneous visible light photoredox and nickel dual catalysis. Obviously, the joint use of inexpensive and bench-stable CdS and nickel salts, together with mild reaction conditions, makes these two transformations attractive for the synthetic community. This heterogeneous
problems of sustainability. Here, we report the design of a novel, highly stable vinyl bridge 2D covalentorganicframework (COF) containing Ni, which combines the role of photosensitizer and reactive site. The as-prepared sp2c-COFdpy-Ni acts as an efficient heterogeneous photocatalyst for C–O crosscoupling. The sp2c-COFdpy-Ni can be completely recovered and used repeatedly without loss of activity,
Palladium-Catalyzed Methoxylation of Aromatic Chlorides with Borate Salts
作者:Gergely L. Tolnai、Bálint Pethő、Péter Králl、Zoltán Novák
DOI:10.1002/adsc.201300687
日期:2014.1.13
a simple palladium‐catalyzed transformation for the methoxylation of aromatic chlorides with tetramethoxyborate salts. The procedure provides a new and efficient synthetic tool for the introduction of a methoxy group into aromaticsystems. In addition, the reaction can be achieved using a wide range of aromatic and heteroaromatic chlorides, the cheapest class of halides.
Trideuteromethylation Enabled by a Sulfoxonium Metathesis Reaction
作者:Zuyuan Shen、Shilei Zhang、Huihui Geng、Jiarui Wang、Xinyu Zhang、Anqi Zhou、Cheng Yao、Xiaobei Chen、Wei Wang
DOI:10.1021/acs.orglett.8b03641
日期:2019.1.18
A conceptually novel sulfoxonium metathesisreaction between TMSOI and cost-effective DMSO-d6 is developed for the efficient generation of a new trideuteromethylation reagent TDMSOI. The new reagent TDMSOI is produced highly efficiently by simply heating a mixture of TMSOI and DMSO-d6 and directly used for subsequent trideuteromethylation in a “one-pot” operation. The preparative power of the new versatile
TMSOI 和经济高效的 DMSO- d 6之间的概念上新颖的硫鎓复分解反应被开发出来,用于有效生成新型三氘代甲基化试剂 TDMSOI。新试剂TDMSOI只需加热TMSOI和DMSO- d 6的混合物即可高效生产,并直接用于后续的“一锅”操作中的三氘代甲基化。新的多功能试剂和“一锅”方案的制备能力通过其以高产率和有用的方式将-CD 3部分安装到广泛的功能中而得到证明,包括苯酚、苯硫酚、酸性胺和烯醇化亚甲基单元。氘化水平 (>87% D)。
Visible‐Light Promoted C–O Bond Formation with an Integrated Carbon Nitride–Nickel Heterogeneous Photocatalyst
photo/Ni dual catalytic cross‐couplingreactions. The dual catalytic Ni‐mpg‐CNx is demonstrated for C–O coupling between aryl halides and aliphatic alcohols under mild condition. The reaction affords the ether product in good‐to‐excellent yields (60–92 %) with broad substrate scope, including heteroaryl and aryl halides bearing electron‐withdrawing, ‐donating and neutral groups. The heterogeneous Ni‐mpg‐CNx
镍沉积介孔石墨氮化碳(Ni-mpg-CN x )是一种廉价、坚固、易于合成和可回收的材料,可作为集成的双光催化系统。该材料克服了现有光/镍双催化交叉偶联反应中对昂贵的光敏剂、有机配体和添加剂的需求以及催化剂失活的限制。双催化 Ni-mpg-CN x被证明可以在温和条件下实现芳基卤化物和脂肪醇之间的 C-O 偶联。该反应以良好到优异的产率(60-92%)提供醚产物,底物范围广泛,包括带有吸电子、给电子和中性基团的杂芳基和芳基卤化物。异质 Ni-mpg-CN x可以很容易地从反应混合物中回收,并在多个循环中重复使用,而不会损失活性。这些发现强调了完全异质系统促进双重催化的令人兴奋的机会。