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Ethyl 3-ethoxy-2-butenoate is used as pharmaceutical intermediate.
Kanwarpal S.Kochhar; Harold W.Pinnick. 3-Alkoxypyrroles by reduction of alkoxypyrrolinones. J. Org. Chem. 1984, 49,(17), 3222-3224.
Craig S.Tomooka; Hui Liu; Harold W.Moore. Concise synthesis of espintanol and selected regioisomeric analogs. J. Org. Chem. 1996, 61,(17), 6009-6012.
Bromination with NBS and reaction with triphenylphosphine, followed by base, gives a phosphorane which is a stable bifunctional reagent for the synthesis of cyclopentenones and ɑß-unsaturated ketones: J. Org. Chem., 59, 111 (1994):