The anions of 1,4‐diaryl‐3‐buten‐2‐ones 1 reacts with arylisothiocyanates, yielding intermediates 4 which can ring close to 5,6‐dihydro‐4H‐thiopyran‐4‐ones 5. Under similar reaction conditions ethyl 3‐oxo‐4‐pentenoates 7 gives the 6‐spiropyrans 9. Methylation of 3 gives the S‐methylated open form 6.