Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → HCID 11099226, compound

Participants

Reaction Conditions

Reaction Steps

A solution of (S)-(−)-2-(tert-butoxycarbonylamino)-3-phenylpropanal (6.87 g, 27.56 mmol) and (carbethoxymethylene)triphenylphosphine (9.60 g, 27.56 mmol) in toluene (150 mL) was stirred and heated to 80° C. for 70 min. The product was isolated by flash column chromatography on silica gel using a gradient elution of 5-25% EtOAc/hexanes. Collection and concentration of the appropriate fractions yielded the compound as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.33-7.22 (m, 3H), 7.19-7.17 (m, 2H), 6.92 (dd, J=4.8, 15.6 Hz, 1H), 5.86 (dd, J=1.6, 15.6 Hz, 1H), 4.62 (br s, 1H), 4.52 (br s, 1H), 4.19 (q, J=7.2, 14.0 Hz, 2H), 2.95-2.90 (m, 2H), 1.40 (s, 9H), 1.30-1.25 (m, 3H); ES MS [M-100 (loss of BOC)+1]=220.

Provenance & Evidence