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. 2016 Jun 29;6:28934. doi: 10.1038/srep28934

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(Left panel) “A-Series” heterocyclics generated by (4 + 3) cycloaddition reactions. ^aindole (1 equiv), carbonyl (2 equiv), diene (5 equiv), GaBr₃ (10 mol%), rt. ^bindole (1 equiv), carbonyl (2 equiv), diene (5 equiv), Ga(OTf)₃ (10 mol%), rt. ^cindole (1 equiv), carbonyl (1.1 equiv), diene (5 equiv), Ga(OTf)₃ (20 mol%), rt. ^dSingle-crystal X-ray analysis. ^e2 mmol scale. (Right panel) “B-Series” heterocyclics generated by (3 + 2) cycloaddition reactions. ^aindole (1 equiv), carbonyl (2 equiv), diene (1.5 equiv), TfOH (20 mol%), rt.