A dehydrative arylation and thiolation of tertiary alcohols catalyzed by in situ generated triflic acid - Viable protocol for C C and C S bond formation
作者:Deblina Roy、Gautam Panda
DOI:10.1016/j.tet.2018.09.009
日期:2018.10
methanes with a quaternary carbon center and 6 triarylmethyl thioarenes) with diverse substitution patterns could be prepared in high yields (up to 82%). Use of indium triflate allowed the transformation to be carried out in an open flask without taking special care leaving water as the only by product. Control experiments revealed that the triflic acid generated in situ from indium triflate, probably through
标题文章讨论了通过邻醌甲基化物中间体有效形成C C和C S键的温和策略。可以高收率(高达82%)制备总共29个具有不同取代方式的实例(23个具有季碳中心的四取代甲烷和6个三芳基甲基硫代芳烃)。使用三氟甲磺酸铟允许在敞口烧瓶中进行转化,而无需特别注意,仅以水作为副产物。对照实验表明,三氟甲磺酸原位生成可能是通过与底物的配合而从三氟甲磺酸铟中提取的,作为转化的实际催化剂。此外,该方案可用于合成有前途的生物活性物质,例如CDRI-830类似物,二氢色酚[2,3- b ]吲哚和9-(1 H-吲哚-3-基)-9-苯基-9 H-黄嘌呤。 -1-醇。
One-Step Synthesis of Substituted Benzofurans from <i>ortho</i>
- Alkenylphenols <i>via</i>
Palladium-Catalyzed CH Functionalization
作者:Dejun Yang、Yifei Zhu、Na Yang、Qiangqiang Jiang、Renhua Liu
DOI:10.1002/adsc.201600082
日期:2016.6.2
A dehydrogenative oxygenation of C(sp2)H bonds with intramolecular phenolic hydroxy groups has been developed, which provides a straightforward and concise access to structurally diversely benzofuransfrom ortho‐alkenylphenols. The reaction is catalyzed by palladium on carbon (Pd/C) without any oxidants and sacrificing hydrogen acceptors.
An efficient asymmetric hydroesterfication of diarylmethyl carbinols is developed for the first time with a Pd‐WingPhos catalyst, resulting in a series of chiral 4‐aryl‐3,4‐dihydrocoumarins in excellent enantioselectivities and good yields. The method features mild reaction conditions, a broad substrate scope, use of easily accessible starting materials, and low palladium loadings. A plausible stereochemical
Synthesis of Spirocyclic Enones by Rhodium-Catalyzed Dearomatizing Oxidative Annulation of 2-Alkenylphenols with Alkynes and Enynes
作者:Szymon Kujawa、Daniel Best、David J. Burns、Hon Wai Lam
DOI:10.1002/chem.201403454
日期:2014.7.7
The dearomatizing oxidative annulation of 2‐alkenylphenols with alkynes and enynes proceeds with high yields and regioselectivities under RhIII catalysis. These reactions are successful using Cu(OAc)2 or air as the stoichiometric oxidant, and provide spirocyclic enones, the basic ring system of which appears in several natural products. Application of this process to the preparation of a highly functionalized