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Synthesis 2006(7): 1123-1126
DOI: 10.1055/s-2006-926380
DOI: 10.1055/s-2006-926380
PAPER
© Georg Thieme Verlag Stuttgart · New York
Catalytic Activity of 1,3-Dibromo-5,5-dimethylhydantoin (DBH) in the One-Pot Transformation of N-Arylglycines to N-Arylsydnones in the Presence of NaNO2/Ac2O under Neutral Conditions: Subsequent Bromination of these Sydnones to their 4-Bromo Derivatives
Further Information
Publication History
Received
17 October 2005
Publication Date:
08 March 2006 (online)


Abstract
1,3-Dibromo-5,5-dimethylhydantoin (DBH) has been found to efficiently catalyze the one-pot conversion of various N-arylglycines through N-nitrosation and cyclization to sydnones in combination with NaNO2 and Ac2O in high yields (80-94%) under mild and neutral conditions. Also, it was shown that DBH can conveniently promote the bromination of these sydnones to their 4-bromo substituted congeners in excellent yields in DMF at room temperature.
Key words
nitrosation - N-arylglycines - sydnones - 1,3-dibromo-5,5-dimethylhydantoin (DBH) - bromination