Ethylmorpholine → HCID 21344943, compound

Participants

Reaction Steps

2.42 g of 1-(N-(tert-butoxycarbonyl)-2(S)-aminobutyryl)-L-proline (8.05 mmol) prepared as in Example 2 c) are dissolved in dry tetrahydrofuran (15 ml). The solution is cooled in an ice/salt bath and 0.927 g of N-ethylmorpholine (8.05 mmol) and 1.10 g of isobutyl chloroformate (8.05 mmol) are then added. The solution is stirred for 45 minutes and 0.59 g (8.05 mmol) of n-butylamine is added. After stirring overnight, methylene chloride (200 ml) is added and the mixture is washed with 10% citric acid (2×100 ml) and then with 5% NaHCO3 (2×100 ml). The organic phase is dried (Na2SO4) and evaporated under vacuum. A syrup is obtained. The deprotection is carried out without characterization.

Provenance & Evidence