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. 2021 Dec 1;122(1):565–788. doi: 10.1021/acs.chemrev.1c00449

Scheme 257. Syntheses of Derivatives of Diazatrioxa[9]circulene and Diazatetraoxa[10]circulene.

Scheme 257

Reagents and conditions: (a)478 DDQ, DCM, rt; (b)479 H2SO4, AcOH, rt, 5–16 h; (c) chloranil, BF3·Et2O, DCM, rt, 45 min.