The AgOAc-catalysed reaction of 3-nitro-2-phenyl-2-chromenes with stabilized azomethine ylides generated from the imines based on methyl glycinate and arylaldehydes leads to a mixture of and ' isomers of the corresponding chromeno[3,4-]pyrrolidines in a ratio of 2.0-2.3:1 in 85-93% total yields as a result of a Michael addition/Mannich reaction sequence.
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