C−H activations with challenging arylacetamides were accomplished by versatile ruthenium(II) biscarboxylate catalysis. The distal C−H functionalization offers ample scope—including twofold oxidative C−H functionalizations and alkyne hydroarylations—through facile base‐assisted internal electrophilic‐type substitution (BIES) C−H ruthenation by weakO‐coordination.
具有挑战性的芳基乙酰胺的CH活化是通过通用的双羧酸钌(II)催化完成的。远端C H功能化提供了广泛的范围-包括双重的氧化C H H功能化和炔烃加氢芳基化-通过弱O配位通过碱辅助的内部亲电子型取代(BIES)CH H钌化。
Divergent Synthesis of α-Fluorinated Carbonyl and Carboxyl Derivatives by Double Electrophilic Activation of Amides
作者:Amaury Dubart、Gwilherm Evano
DOI:10.1021/acs.orglett.1c03450
日期:2021.11.19
entry to α-fluorinated carbonyl and carboxyl derivatives is reported. Upon activation of amides with triflic anhydride and a 2-halo-pyridine and subsequent trapping of the resulting keteniminium ions with nucleophiles followed by a second electrophilic activation with NFSI and final hydrolysis, a range of amides can be transformed to α-fluorinated ketones, esters, and amides under mild conditions. Moreover
We developed a new transition-metal-free intermolecular Claisenrearrangement process to introduce allyl and allenyl groups into the α position of tertiary amides. In this transformation, amides were activated by trifluoromethanesulfonic anhydride to produce the keteniminium ion intermediates that exhibit strong electrophilic activity. This atom-economical process delivers α position-modified amides