1-((Tert-butoxy)carbonyl)-3,3-dimethylpyrrolidine-2-carboxylic acid → 1-(tert-butoxycarbonyl)-3,3-dimethylprolyl-N-(2-{[(tert-butoxycarbonyl)amino]methyl}-5-chlorobenzyl)-L-prolinamide

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Reaction Steps

1-(tert-Butoxycarbonyl)-3,3-dimethylprolyl-N-(2-{[(tert-butoxycarbonyl)amino]methyl}-5-chlorobenzyl)-L-prolinamide was prepared as a mixture of diastereomers from 1-(tert-butoxycarbonyl)-3,3-dimethyl-D,L-proline (73 mg, 0.30 mmol) and L-prolin-N-(2-{[(tert-butoxycarbonyl)amino]methyl}-5-chlorobenzyl)amide (111 mg, 0.30 mmol) essentially according to the EDC coupling procedure described in Step 3 of Example 46. The diastereomeric products were separated by reverse phase HPLC as described in Step 3 of Example 46. Diastereomer A: LCMS RT=2.44 min. LCMS (M+H)=593.4. Diastereomer B: LCMS RT=2.58 min. LCMS (M+H)=593.5.

Provenance & Evidence