Heterogeneous palladium (II)‐complexed dendronized polymer: A rare palladium catalyst for the one‐pot synthesis of 2‐arylbenzoxazoles

The palladium complex of dendronized amine polymer (EG–Gn–Pd, n = 0, 1 and 2) having ethylene glycol‐initiated polyepichlorohydrin as core was synthesized on a Merrifield resin support and was well characterized. Generally, palladium catalysts are known for carbon–carbon coupling reactions. Here, a developed catalyst was found to be good for benzoxazole synthesis. Higher generation dendronized polymer (EG–G2–Pd) was found to be better catalyst over lower generation dendronized polymers. Moreover, dendronized polymers were found to be a better catalyst over dendrigraft polymers. The catalyst reusability was checked and good yield was obtained for five cycles. Pd (II) complex of dendronized polymer EG–G2–Pd was synthesized and characterized. The catalytic activity of heterogeneous EG–G2–Pd was evaluated for benzoxazole synthesis. Reusability of the catalyst was checked up to 5 cycles.