Fe 3 O 4 @SiO 2 @sulfated boric acid as superparamagnetic and recyclable nanocatalyst‐assisted, one‐pot, pseudo four‐component synthesis of 5‐amino‐2‐aryl‐3 H ‐chromeno[4,3,2‐ de ][1,6]naphthyridine‐4‐carbonitrile derivatives

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