“…Recently, we have reported a novel method for the diversity‐oriented synthesis of the spiropentadiene pyrazolones and 1 H ‐oxepino[2,3‐ c ]pyrazoles by a tandem phospha‐1,6‐addition of PBu 3 to doubly conjugated pyrazolones (Scheme 1a) [2a] . Very recently, we have also demonstrated a new method for the construction of functionalized furo[3,2‐ c ]coumarins from terminal alkynoates, PPh 3 , and acyl chlorides in the presence of a base (Scheme 1b) [6] . In continuation of our interest in the chemoselective phosphine‐mediated transformations, [7] we conceived that an appropriately positioned α,β‐unsaturated carbonyl functionality within the alkynoate substrates could provide the two different electrophilic sites for Michael addition, which would facilitate the sequence of prominent reactions and thus leads to a series of complex skeletons.…”