Ethyl 4-(dimethylamino)-2-oxo-but-3-enoate → ethyl 1-cyclopropyl-1H-pyrazole-5-carboxylate

Participants

Reaction Steps

The title compound was prepared in analogy to the procedure described in Step 17.3 using cyclopropylhydrazine (Step 17.2) and ethyl 4-(Dimethylamino)-2-oxobut-3-enoate at 125° C. for 8 hr. The crude product was purified by silica gel column chromatography (hexane/EtOAc 2.5-45%). tR: 4.40 min (HPLC 1); tR: 0.91 min (LC-MS 2); ESI-MS: 181 [M+H]+ (LC-MS 2); Rf=0.85 (hexane/EtOAc 1:1).

Provenance & Evidence