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

Scheme 9. Synthesis of π-Extended Biscoumarins.

Scheme 9

Reagents and conditions: (a)7 K2CO3, DMSO, 100 °C; (b) hν, THF, rt; (c)8 K2CO3, DMSO, 100 °C; (d) BBr3, DCM, −40 °C to rt; (e) C6H13Br, K2CO3, DMF, 60 °C; (f) FeCl3, DCM, rt.