Phosphine-Catalyzed [3 + 2] Cycloaddition of Sulfamate-Derived Cyclic Imines with Allenoate: Synthesis of Sulfamate-Fused Dihydropyrroles
摘要:
Ph3P-catalyzed [3 + 2] cycloaddition reaction of sulfamate-derived cyclic;mines with allenoate has been developed, affording sulfamate-fused dihydropyrroles under very mild conditions in high yields. Using amino acid-based bifunctional phosphine as chiral catalyst, its asymmetric variant provided the corresponding products in good yields with moderate to excellent enantiomeric excesses (up to 91% yield and up to 98% ee). Subsequent transformations of the heterocyclic products gave various pharmaceutically attractive compounds.
Ph3P-catalyzed [3 + 2] cycloaddition reaction of sulfamate-derived cyclic;mines with allenoate has been developed, affording sulfamate-fused dihydropyrroles under very mild conditions in high yields. Using amino acid-based bifunctional phosphine as chiral catalyst, its asymmetric variant provided the corresponding products in good yields with moderate to excellent enantiomeric excesses (up to 91% yield and up to 98% ee). Subsequent transformations of the heterocyclic products gave various pharmaceutically attractive compounds.
Phosphane-Catalyzed [3+2] Cycloaddition Reaction of Allenoate and Cyclic Imines: A Simple and Efficient Method for Synthesis of Benzo-Fused Cyclic Sulfamidate Heterocycles
organocatalyst, an efficientsynthesis of benzo-fusedcyclicsulfamidateheterocycles has been developed through a cycloadditionreaction of allenoate and cyclicimines including cyclic trifluoromethyl ketimine, which gave high yields (71–97 %). The reaction could also be conveniently performed on a gram scale. Furthermore, some simple transformations of the sulfamidateheterocycle products have been