1,2-Dichloroethane → HCID 18463919, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-[6-(4-allyloxy-3,5-dichloro-benzoylamino)-2-methyl-3,7-dioxo-[1,2]diazepan-1-yl]-propionic acid (18) (183 mg, 0.40 mmol) in dichloromethane was added HOBT (65 mg, 0.48 mmol) followed by EDC (123 mg, 0.64 mmol). The mixture was stirred at 0° C. for 30 min, then a solution of (2-benzyloxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid allyl ester (9, anti diastereomer) (140 mg, 0.48 mmol) in dichloromethane, charged with 1,3-dimethylbarbituric acid (DMBA) (75 mg, 0.48 mmol) and Pd(PPh3)4 (60 mg, 0.05 mmol) for 30 min, was added and the resulting mixture was stirred at room temperature for 5 hours. The second portion of DMBA (63 mg, 0.40 mmol) was added and the reaction mixture was continuously stirred at room temperature for 16 hours. The reaction was quenched with water and extracted with dichloromethane. The organic layer was dried over anhydrous Na2SO4, filtered and evaporated to give a pale yellow solid, that was purified by flash chromatography using dichloromethane/methanol (99/1 to 95/5) to afford 70 mg (29% yield) of the title compound as a mixture of diastereomers. 1H-NMR (500 MHz, CDCl3) δ 1.39-1.45 (m, 3H), 2.60-2.80 (m, 2H), 2.80-3.10 (m, 1H), 3.12-3.32 (m, 4H), 4.20-4.62 (m, 2H), 4.70-4.88 (m, 2H), 5.25-5.45 (m, 1H), 6.65-6.95 (m, 3H), 7.20-7.50 (m, 5H), 7.61 (s, 1H), 7.72 (d, 1H). Analytical HPLC: 10.86 and 10.98 min. LC-MS (ES+): m/e=607, 609 (M+H+).

Provenance & Evidence