Potassium Carbonate → (R)-1-(4-benzyloxy-3,5-dimethyl-benzyl)-2-(1'-ethoxycarbonylmethyl-4,4'-bipiperidinyl-1-yl)-2-oxo-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate

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Reaction Steps

0.99 g (3.90 mmol) ethyl [4,4′]bipiperidinyl-1-yl-acetate were added at RT to a solution of 2.00 g (3.50 mmol) (R)-2-(4-benzyloxy-3,5-dimethyl-phenyl)-1-carboxy-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate (Example 1g), 1.25 g (3.90 mmol) TBTU and 0.67 mL (3.90 mmol) ethyldiisopropylamine in 20 mL THF and 5 mL DMF and the reaction mixture was stirred overnight. 15% K2CO3 solution was added, the mixture was extracted exhaustively with EtOAc, the combined organic phases were washed with saturated NaCl solution and dried on Na2SO4. After the elimination of the desiccant and solvent the product was obtained, which was reacted further without purification.

Provenance & Evidence