Carbon transfer reactions of functionalized oxazolidines and their open chain enamine tautomers to enamine nucleophiles. A facile synthesis of substituted pyridines and ring annulated derivatives
摘要:
Oxazolidines substituted at C-2 with -CH2-EW(-CO-, etc.) and capable of existing as ring-chain (enamine) tautomers' react with cyclic, acyclic and heterocyclic enamine derivatives in a 1:1 stoichiometric manner to provide a versatile synthesis of substituted pyridines and their ring annulated derivatives. (C) 1997 Elsevier Science Ltd. All rights reserved.
with three bioassays, Arabidopsis and lettuce seed germination and rice seedling elongation. Some of them, i.e., 2′,3′-iso-pyridoabscisic acid (iso-PyABA) and 2′,3′-iso-franoabscisic acid (iso-FrABA), displayed good bioactivities that closed to iso-PhABA and natural (+)-ABA. Some others, for instance, substituted-iso-PhABA, exhibited certain selectivity to different physiological process when compared