Heterocycles derivatives as inner-outer ring dienes

2 Heterocyclic derivatives as inner-outer ring dienes 

Diazo-substituted 1,2,3-triazoles undergo regiospecific dipolar cycloaddition reactions with electron-rich unsaturated compounds. Thus, 4-diazo-5-phenyl-4/7-1,2,3-triazole (372) reacts with l-morpholinyl-2-nitroethene by a net 1,7-cycloaddition and elimination of morpholine to give the product (373) (87JOC5538). 

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