Scheme 3.
Exploring other alkene cycloadditions: (i) 5b (1.0 equiv.), BnN3 (10.0 equiv.), 100 °C, 48 h, 34 %; (ii) 5a (1.0 equiv.), NH2NH2 ·H2O (1.2 equiv.), EtOH, 70 °C, 24 h, 68 %.
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