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"Sandwich" Diimine-Copper Catalyzed Trifluoroethylation and Pentafluoropropylation of Unactivated C(sp3 )-H Bonds by Carbene Insertion.

ABSTRACT: We report here "sandwich"-diimine copper complex-catalyzed trifluoroethylation and pentafluoropropylation of unactivated C(sp3 )-H bonds in alkyl esters, halides, and protected amines by employing CF3 CHN2 and CF3 CF2 CHN2 reagents. Reactions proceed in dichloromethane solvent at room temperature. Identical C-H functionalization conditions and stoichiometries are employed for generality and convenience. Selectivities for C-H insertions are higher for compounds possessing stronger electron-withdrawing substituents. Preliminary mechanistic studies point to a mechanism involving a pre-equilibrium forming a "sandwich"-diimine copper-CF3 CHN2 complex followed by rate-determining loss of nitrogen affording the reactive copper carbene. It reacts with trifluoromethyldiazomethane about 6.5 times faster than with 1-fluoroadamantane explaining the need for slow addition of the diazo compound.

SUBMITTER: Le TV 

PROVIDER: S-EPMC10642771 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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"Sandwich" Diimine-Copper Catalyzed Trifluoroethylation and Pentafluoropropylation of Unactivated C(sp<sup>3</sup> )-H Bonds by Carbene Insertion.

Le Thanh V TV   Romero Irvin I   Daugulis Olafs O  

Chemistry (Weinheim an der Bergstrasse, Germany) 20230724 48

We report here "sandwich"-diimine copper complex-catalyzed trifluoroethylation and pentafluoropropylation of unactivated C(sp<sup>3</sup> )-H bonds in alkyl esters, halides, and protected amines by employing CF<sub>3</sub> CHN<sub>2</sub> and CF<sub>3</sub> CF<sub>2</sub> CHN<sub>2</sub> reagents. Reactions proceed in dichloromethane solvent at room temperature. Identical C-H functionalization conditions and stoichiometries are employed for generality and convenience. Selectivities for C-H inser  ...[more]

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