Streamlined Access to Functionalized Chromenes and Quinolines using Domino Reactions of Salicylic Aldehydes and Methyl 4‐Chloro‐2‐butynoate

Methyl 4‐chloro‐2‐butynoate was used in a modified Morita–Baylis–Hillman reaction with salicylic aldehydes. The chlorine atom in the alkynoate moiety allows its efficient isomerization to the corresponding allene, and remains in the adduct as a reactive site. Further one‐pot derivatization leads to a variety of substituted chromenes and quinolines.