Expedient Iron-Catalyzed C−H Allylation/Alkylation by Triazole Assistance with Ample Scope
作者:Gianpiero Cera、Tobias Haven、Lutz Ackermann
DOI:10.1002/anie.201509603
日期:2016.1.22
for the iron‐catalyzed C−H allylation of arenes, heteroarenes, and alkenes with ample scope. The versatile catalyst also proved competent for site‐selective methylation, benzylation, and alkylation with challenging primary and secondary halides. Triazole‐assisted C−H activation proceeded chemo‐, site‐, and diastereo‐selectively, and the modular TAM directing group was readily removed in a traceless
Iron‐Catalyzed C−H Alkynylation through Triazole Assistance: Expedient Access to Bioactive Heterocycles
作者:Gianpiero Cera、Tobias Haven、Lutz Ackermann
DOI:10.1002/chem.201700587
日期:2017.3.13
Triazole assistance enabled the first iron‐catalyzed C−H alkynylation of arenes, heteroarenes, and alkenes. The modular TAM directing group set the stage for a sequential C−H alkynylation/annulation strategy with ample scope, enabling the iron‐catalyzed assembly of isoquinolones, pyridones, pyrrolones, and isoindolinones with high levels of chemo‐, site‐, and regioselectivity.
Versatile palladium-catalyzed CH arylations of benzamides were accomplished by triazole amine (TAM) assistance. The robustness of the palladium-catalyzed CH functionalization protocol was reflected by its broad functional group tolerance, ample substrate scope and CH arylations under silver-free reaction conditions.
Silver-Free Palladium-Catalyzed sp<sup>3</sup> and sp<sup>2</sup> C–H Alkynylation Promoted by a 1,2,3-Triazole Amine Directing Group
作者:Xiaohan Ye、Chang Xu、Lukasz Wojtas、Novruz G. Akhmedov、Hao Chen、Xiaodong Shi
DOI:10.1021/acs.orglett.6b01319
日期:2016.6.17
Triazole amine was identified as an effective directing group in promoting C-H alkynylation under silver-free conditions. No other external oxidant was required, and the alkynylation products were received in good to excellent yields. X-ray crystallographic analysis confirmed a direct C-H activation intermediate. Other typical directing groups, including pyridine amine (PIP) and 8-aminoquinoline (QA), gave almost no reaction under identical conditions, which highlighted the unique reactivity of the triazole directing group in direct C-H functionalization.