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Fifteen novel 1-(substituted phenylcarbonyl/sulfonylamino)-1,2,3,6-tetrahydro- pyridine-5-carboxylic acid diethylamide (7, 15) were synthesized in fair to good yields via sodium borohydride reduction of the corresponding 1-(substituted phenylcarbonyl/ sulfonylimino)-3-diethylcarbamoyl pyridinium ylides (6, 14) in absolute ethanol.
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Gangapuram et al. (2006) studied this question.
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