Vittorio Caprio and John Mann
A concise synthesis of two novel chromeno[3,4-b]pyridin-9-ones (as their ethylene ketals) has been achieved using, as a key step, the reaction between a mixed cuprate derived from 6-methoxy-2-methyl-3-lithiopyridine and 4-tert-butyldimethylsiloxycyclohex-2-enone.