Add time:07/12/2019         Source:sciencedirect.com

A unique photoreaction of methyl 6-chloro-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-carboxylate in methanol gives four β -lactam compounds, methyl 6-chloro-2,9-dioxo-1-methyl-1-azaspiro[3.5]nona-5,7-diene-8-carboxylate and three stereoisomers of dimethyl 3-chloro-4-(1′-methyl-2′-oxoazetidin-4′-ylidene)-2-butene-1,1-dicarboxylate.

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