抽象的 吲哚支架的合成主要依靠N保护的链烯基苯胺的C–H氧化胺化作用进行C–N分子内环化反应。在此,在没有催化N的情况下,通过在催化量的FeF 2存在下使用K 2 S 2 O 8作为氧化剂,将各种容易制备的2-烯基苯胺以高收率转化成所需的吲哚产物。K 2 S 2 O 8 / FeF 2系统为3-芳基吲哚提供了直接而良性的合成途径,适用于包括药物中间体在内的各种取代的吲哚。 吲哚支架的合成主要依靠N保护的链烯基苯胺的C–H氧化胺化作用进行C–N分子内环化反应。在此,在没有催化N的情况下,通过在催化量的FeF 2存在下使用K 2 S 2 O 8作为氧化剂,将各种容易制备的2-烯基苯胺以高收率转化成所需的吲哚产物。K 2 S 2 O 8 / FeF 2系统为3-芳基吲哚提供了直接而良性的合成途径,适用于包括药物中间体在内的各种取代的吲哚。
Catalyst-free and selective trifluoromethylative cyclization of acryloanilides using PhICF<sub>3</sub>Cl
作者:Jia Guo、Cong Xu、Ling Wang、Wanqiao Huang、Mang Wang
DOI:10.1039/c9ob00601j
日期:——
Trifluoromethylation-triggered cyclization of alkenes provides a useful route to CF3-containing cyclic compounds. Current approaches to generate CF3-based initiators from a CF3 source require a catalyst or an activator. This work describes a catalyst-free protocol to innately produce electrophilic CF3 species from PhICF3Cl for trifluoromethylative cyclization of acryloanilides. A new domino biscyclization of dienes
Direct Electrophilic C−H Alkynylation of Unprotected 2-Vinylanilines
作者:Lucien D. Caspers、Peter Finkbeiner、Boris J. Nachtsheim
DOI:10.1002/chem.201606026
日期:2017.2.24
Unprotected aromatic amines can be used as directing groups in metal‐catalyzed C−H alkynylations of alkenes. By using low amounts of an IrIII catalyst in combination with alkynylbenziodoxolones as electrophilic alkyne‐transfer reagents, highly desirable 1,3‐enynes were isolated in excellent yields of up to 98 % with Z stereoselectivity. A broad substrate scope as well as the high synthetic utility
NH<sub>2</sub>-Directed C–H Alkenylation of 2-Vinylanilines with Vinylbenziodoxolones
作者:Andreas Boelke、Lucien D. Caspers、Boris J. Nachtsheim
DOI:10.1021/acs.orglett.7b02630
日期:2017.10.6
directing-group-mediated C–H alkenylation with alkenyl-λ3-iodanes as electrophilic alkene-transfer reagents has been developed. The application of free aromatic amines as challenging but synthetically valuable directing groups in combination with an IrIII catalyst enabled the synthesis of highly desirable 1,3-dienes in excellent yields of up to 98% with high to perfect (Z,E) stereoselectivity. A broad substrate
Palladium-catalyzed cascade reactions of alkene-tethered carbamoyl chlorides with <i>N</i>-tosyl hydrazones: synthesis of alkene-functionalized oxindoles
A palladium-catalyzed cascade reaction of alkene-tethered carbamoylchlorides with N-tosyl hydrazones is described. It provided a new way to synthesize various alkene-functionalized oxindoles bearing an all-carbon quaternary center. The olefin moieties could serve as versatile handles for further elaboration. This transformation was highly efficient and showed good functional group tolerance.
We report the first example of palladium‐catalyzed phosphoryl‐carbamoylation of alkene‐tethered carbamoyl chlorides with P(O)H compounds. Both H‐phosphinates and secondary phosphine oxides are compatible with this reaction. DPE‐Phos was used as ligand to facilitate nonbenzylic C(sp3 )−P bonds formations via C(sp3 )−Pd(II)−P reductive elimination. By using this protocol, a range of phosphorylated