The present invention provides a process for the preparation of (15)-2-((5)-2-((5)-2-cyclohexyl-2-(pyrazine-2- carboxamido)acetamido)-3,3-dimethylbutanoyl)octahydro -cyclopenta[c]pyrrole-l-carboxylic acid derivative of formula (I), which comprises: condensing (l1S,3a/,6aS)-alkyl-2-((5)-2-amino-3,3-dimethylbutanoyl)octahydrocyclo -penta[c] pyrrole-1 -carboxylate of formula (XV), with (iS)-2-cyclohexyl-2-(pyrazine-2-carboxamido)acetic acid of formula (XVI), followed by isolating the compound of formula (I), then converted to Telaprevir of formula (II). The present invention also provides a process for the preparation of compound of formula (XV).
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