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The three‐components one‐pot Kabachnik‐Fields reaction of sulfapyridine, diethyl phosphite, and aldehyde under thermal catalysis reaction condition in the presence of bismuth (III) triflate as a catalyst afford the corresponding sulfonamide‐phosphonates (3a−3p) in good to excellent yields (78%−91%). The structures of the new synthesized compounds were elucidated and confirmed by variable spectroscopic...