Synthesis of 2H‐pyrano[2,3‐b]quinolines. Part I

Abstract 3,4‐Dihydro‐2H‐pyrano[2,3‐b]quinolines 5a‐e and 2H‐pyrano[2,3‐b]quinolines 10a‐c were synthesised starting from the appropriate ω‐chloro‐n‐valeroylanilides 2a‐e. Compounds 10a‐c were transformed to analogs of the novel antihypertensive agent Cromakalim (1).