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Synthesis 2003(9): 1457-1461
DOI: 10.1055/s-2003-40193
DOI: 10.1055/s-2003-40193
SPECIALTOPIC
© Georg Thieme Verlag Stuttgart ˙ New York
Total Regio- and Stereoselective Synthesis of Perhydropyrrolo[3,4-c]pyrazole Derivatives by [3+2] Intramolecular Dipolar Cycloaddition Reaction on Chiral Perhydro-1,3-benzoxazines
Further Information
Received
28 April 2003
Publication Date:
24 June 2003 (online)
Publication History
Publication Date:
24 June 2003 (online)

Abstract
Reaction of N-acyl-N′-methyl- or N-acyl-N′-phenylhydrazines with chiral 3-allyl-2-formylperhydro-1,3-benzoxazines form azomethine imines that cyclize to give perhydropyrrolo[3,4-c]pyrazole derivatives. The dipolar cycloaddition was totally regio- and stereoselective yielding a single diastereoisomer. The reaction conditions and the yields of the final compounds are dependent on the substitution pattern of the olefinic bond
Key words
asymmetric synthesis - azomethine imines - dipolar cycloaddition - pyrazolidines - stereoselective synthesis
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