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Palladium(II) N∧O Chelating Complexes Catalyzed One-Pot Approach for Synthesis of Quinazolin-4(3H)-ones via Acceptorless Dehydrogenative Coupling of Benzyl Alcohols and 2-Aminobenzamide

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ORGANOMETALLICS
卷 40, 期 6, 页码 725-734

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AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.0c00814

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  1. Indo-French Centre for the Promotion of Advanced Research (IFCPAR/CEFIPRA) [5005-1]

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A convenient protocol for the one-pot synthesis of quinazolin-4(3H)-ones using palladium(II) complexes via dehydrogenative coupling of benzyl alcohols and 2-aminobenzamide has been described. New structurally related Pd(II) N and O chelating complexes were designed and synthesized, with their formation confirmed by analytical and spectral methods. The study also confirmed the square-planar geometry around the palladium(II) ion and successfully achieved a wide range of substituted quinazolinones.
A convenient protocol for the one-pot synthesis of quinazolin-4(3H)-ones using palladium(II) complexes via dehydrogenative coupling of readily available benzyl alcohols and 2-aminobenzamide has been described. New structurally related Pd(II) N boolean AND O chelating complexes of general configuration [Pd(L)Cl(PPh3)] (where L = dimethylamino benzoylhydrazone ligands) have been designed and synthesized. The formation of the complexes has been recognized by analytical and spectral methods (FT-IR, NMR, HR-MS). The presence of a square-planar geometry around the palladium(II) ion was confirmed by single crystal X-ray diffraction study. A wide range of substituted quinazolinones have been successfully achieved from a diverse range of benzyl alcohols in good to excellent yields using 1.0 mol % of catalyst loading under aerobic conditions. Furthermore, control experiments reveal that the dehydrogenative coupling reaction involves initially the formation of an aldehyde intermediate and subsequent formation of a cyclic aminal intermediate.

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