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To a mixture of 1.5 g (3.8 mmol) of methyl 2-[(2-aminobenzyl)-(4-methoxybenzenesulfonyl)amino]-3-hydroxypropionate and 2.65 ml of triethylamine in 12 ml of CH2Cl2 chilled at 0° C. was added a solution of [1,1'-biphenyl]-2-carbonyl chloride in 6 ml of CH2Cl2. The mixture was stirred at room temperature overnight and diluted with CH2Cl2 and H2O. The organic layer was separated and washed with 2 N citric acid, brine and dried-with Na2SO4. The solvent was removed under vacuum to give 2.2 g of a white foam. Anal. for C31H28N2O6S: Calc'd: C,66.9; H,5.1; N,5.0; Found: C,67.3; H,5.2; N,4.7.

1. customThe organic layer was separated
2. washwashed with 2 N citric acid, brine and dried-with Na2SO4
3. customThe solvent was removed under vacuum