Once you have the β-ketoester precursor, perform a Dieckmann condensation. This involves heating the precursor in the presence of a strong base (typically an alkoxide, like sodium ethoxide or potassium tert-butoxide) in an appropriate solvent. The base deprotonates the β-ketoester, leading to the formation of an enolate ion, which then undergoes intramolecular cyclization.
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methyl 2-({[1-(2-ethoxy-2-oxoethyl)-1H-pyrrol-2-yl]carbonyl}amino)benzoate
4,4-Dimethyl-5-oxo-2-phenethyl-tetrahydro-furan-3-carboxylic acid ethyl ester
