Patent ID: 10851134

Abstract:
A method for preparing a cyclopeptide, which includes the following steps: (A) providing compounds represented by the following formulas (II-1) or (II′-1) and (II-2); (B) performing a reaction between the compounds of formulas (II-1) or (II′-1) and (II-2), to obtain a compound represented by the following formula (II-3) and (II′-3), respectively; (C) performing a reaction between the compound of formula (II-3) or (II′-3) and a compound represented by the following formula (II-4) or (II′-4), respectively, is performed, to obtain a compound represented by the following formula (II-5), and (II′-5), respectively; (D) performing a cyclization reaction of the compound of formula (II-5) or (II′-5) with a catalyst of formula (III), to obtain a compound represented by the following formula (I) or (I′), respectively. The formulas (I), (I′), (II-1) to (II-5), (II′-1) to (II′-5) and (III) are shown in the specification.