Formaldehyde → HCID 53312154, compound

Participants

Reaction Steps

(S)-3-Benzoyl-5-biphenyl-4-ylmethyl-1-((E)-styryl)-pyrrolidin-2-one (4a, R1=styryl, R4=phenyl) (1.0 g, 2.2 mmol) is dissolved in 5 mL of anhydrous tetrahydrofuran, add paraformaldehyde (80 mg, 2.6 mmol), DBU (434 mg, 2.8 mmol) and anhydrous Lithium chloride (186 mg, 4.4 mmol), reflux overnight under nitrogen atmosphere. The reaction mixture is cooled to room temperature, add 20 mL of toluene, wash with 5% HCl(aq), saturated Na2CO3 and brine, dry over anhydrous Na2SO4, evaporate the solvent under vacuum to give (R)-5-Biphenyl-4-ylmethyl-3-methylene-1-((E)-styryl)-pyrrolidin-2-one (1a, R1=styryl). Spectroscopic data as Example 23, Method 1.

Provenance & Evidence