Polysubstituted indoles are prevalent in pharmaceuticals, agrochemicals, and organic materials. Presented herein is the fact that polyfunctionalized indoles can be efficiently constructed from easily accessible oxime esters and aryl iodides, involving a palladium/norbornene synergistic synthesis. The reaction is enabled by a unique class of electrophiles in palladium/norbornene cooperative catalysis
Synthesis of Heterocycle-fused Pyridine<i>N</i>-Oxides from Oximes and Diazo Compounds<i>via</i>Rh<sup>III</sup>-Catalyzed CH Activation and Annulation
作者:Peng Sun、Youzhi Wu、Tie Yang、Xiaoming Wu、Jinyi Xu、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.201500125
日期:2015.8.10
A RhIII‐catalyzed tandem CH activation and CN bond formation reaction between oximes and diazo compounds for the synthesis of heterocycle‐fused pyridine N‐oxides has been developed. The reaction exhibits good functional group tolerance and regioselectivity. After simple transformation, the 1‐substituted, 1,3‐disubstituted, 1,4‐disubstituted and 1,3,4‐trisubstituted heterocycle‐fused pyridines were
Synthesis of <i>N</i>-Trifluoromethanesulfinyl Ketimines by Cascade Trifluoromethylthiolation/Rearrangement of Ketoximes
作者:Bora Kim、Junho Park、Chang-Woo Cho
DOI:10.1021/acs.orglett.1c01338
日期:2021.6.18
A new and efficient cascade electrophilic trifluoromethylthiolation/radical rearrangement reaction of ketoximes is reported using N-trifluoromethylthio-dibenzenesulfonimide as the SCF3 source without any additives. This simple one-pot reaction provides the corresponding N-trifluoromethanesulfinyl ketimine products in good yields with high E selectivity under mild reaction conditions.
Single C(sp<sup>3</sup>)–F Bond Activation in a CF<sub>3</sub> Group: <i>Ipso</i>-Defluorooxylation of (Trifluoromethyl)alkenes with Oximes
作者:Hao Zeng、Chuanle Zhu、Huanfeng Jiang
DOI:10.1021/acs.orglett.9b00074
日期:2019.2.15
This exclusively regioselective ipso-defluorooxylation of (trifluoromethyl)alkenes with oximes affords various attractive O-(1,1-difluoroallyl)oxime ethers efficiently via a chemoselective singleC(sp3)–F bond activation in the CF3 group. Primary mechanism studies indicated an anionic SN2-type substitution pathway might be involved in this transformation.
报道了(三氟甲基)烯烃的第一个脱氟ipso-官能化反应。这个专门区域选择性本位的(三氟甲基)与肟,得到各种吸引力烯烃-defluorooxylation ø -通过化学选择性单C(SP高效地(1,1-二氟烯丙基)肟醚3)-F键活化的CF中3组。主要机理研究表明,阴离子S N 2型取代途径可能参与了该转化过程。
Deconstructive Insertion of Oximes into Coumarins: Modular Synthesis of Dihydrobenzofuran-Fused Pyridones
dihydrobenzofuran-fused pyridones in moderate to good yields with good functional group compatibility. The reaction likely involves a radical relay annulation, leading to the ring opening of the lactone moiety of the coumarins, and simultaneous formation of three new bonds. The investigation of photoluminescent properties reveals that several obtained compounds may have potential as fluorescent materials.