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Stereoselective synthesis of 5-(4-azetidinyl)-proline esters via 1,3-dipolar cycloaddition reaction of N-metalated azomethine ylides
Authors:G SubramaniyanR Raghunathan  Ana M Martin Castro
Institution:a Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India
b Departamento de Quimica Organica, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid, Spain
Abstract:The conformationally locked s-trans enone functionality present in the (E)-3-arylidene-4-chromanones undergo regioselective 1,3-dipolar cycloaddition reaction with N-metalated azomethine ylides derived from β-lactam imines of glycine methyl ester in the presence of silver acetate to give spiropyrrolidines in moderate to good yield. The regio and stereochemistry of the cycloadducts have been established by single crystal X-ray structure and spectroscopic techniques.
Keywords:β-lactams  azomethine ylides  cycloadditions  spirocompounds
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