A rapid and efficient entry to synthesis of quino and chromenocarbazoles via Ullmann–Goldberg condensation

An efficient two-step method for the preparation of quino and chromenocarbazoles via Ullmann–Goldberg condensation of 3-aminocarbazole and 3-hydroxy-9-ethylcarbazole with o-halobenzoic acids followed by cyclization with POCl3 has been described.

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