4.6 Article

A novel quinoline-based NNN-pincer Cu(II) complex as a superior catalyst for oxidative esterification of allylic C(sp3)-H bonds

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ORGANIC & BIOMOLECULAR CHEMISTRY
卷 20, 期 17, 页码 3540-3549

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ob00220e

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  1. UGC
  2. CSIR

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This study reports a novel quinoline-based metal complex as an efficient catalyst for oxidative reactions. The catalyst can facilitate the reaction between allyl bonds and acids to synthesize allyl esters at ambient temperature, showing excellent catalytic activity and high yields.
We report for the first time that the quinoline-based NNN-pincer Cu(II) complex acts as an air stable superior catalyst for the oxidative cross-coupling of the allyl sp(3) C-H bond with an acid for the synthesis of allyl esters in a homogeneous system at ambient temperature. The synthesized catalyst, 1, has been well characterized by various analytical techniques (HRMS, single crystal X-ray diffraction, CV, EPR, UV-vis spectroscopy) and showed excellent catalytic activity for the oxidative esterification of allylic C(sp(3))-H bonds at 40 degrees C within a very short period of time (1 h) using only 1 mol% of the catalyst. A wide variety of aromatic allylic esters were synthesized in moderate to good yields, which could be extended to aliphatic allyl esters as well.

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