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

Scheme 4. Synthesis of a HBC-Like System Containing a Pyrrole Ring.

Scheme 4

Reagents and conditions: (a)2 2,3,4,5-tetrakis(4-tert-butylphenyl)cyclopenta-2,4-dien-1-one, toluene, 200 °C, 18 h for 4.1a 72 h for 4.1b; (b) 2,3,4,5-tetrakis(4-(t-butyl)phenyl)cyclopenta-2,4-dien-1-one, THF, dioxane, Co2(CO)8, 160 °C, 15 min, microwave, 350 W; (c) FeCl3, DCM, MeNO2, 0 °C.