Asymmetric Synthesis of Isoxazole and Trifluoromethyl‐Containing 3,2’‐Pyrrolidinyl Dispirooxindoles via Squaramide‐Catalysed [3 + 2] Cycloaddition Reactions
A highly efficient squaramide‐catalysed asymmetric domino Michael/Mannich [3 + 2] cycloaddition of 3‐methyl‐4‐nitro‐5‐ isatylidenyl‐isoxazoles and N‐2,2,2‐trifluoroethylisatin ketimines was developed. A new class of complex and skeletondiversified isoxazole and trifluoromethyl‐containing 3,2’‐pyrrolidinyl...
1996 ◽
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