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- W3042800590 abstract "The preceding article described the development of the large-scale synthetic route to macrocycle 3 of glecaprevir (1), a potent HCV protease inhibitor. This article describes the development of the synthesis of the difluoromethyl-substituted cyclopropyl amino acid 4, its conversion to the fully elaborated side chain, amino sulfonamide 2, and the subsequent final coupling to form glecaprevir. The synthesis of amino acid 4 consists of four key transformations: (a) formation of the difluoromethyl-substituted cyclopropane ring of (±)-diester 15 via Knoevenagel condensation and Corey–Chaykovsky cyclopropanation, (b) diastereoselective hydrolysis of (±)-diester 15 to yield (±)-monoacid 14a–b, (c) conversion of (±)-monoacid 14a–b to (±)-amino ester 10 via a Curtius rearrangement, and (d) resolution of (±)-amino ester 10 followed by saponification to give the desired (1R,2R)-amino acid 4. The large-scale synthetic route to amino acid 4 was successfully used to produce the fully elaborated side chain 2 and ultimately the amount of glecaprevir required to support the late-stage clinical development." @default.
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- W3042800590 date "2020-07-13" @default.
- W3042800590 modified "2023-09-27" @default.
- W3042800590 title "Development of a Large-Scale Route to Glecaprevir: Synthesis of the Side Chain and Final Assembly" @default.
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- W3042800590 doi "https://doi.org/10.1021/acs.oprd.0c00245" @default.
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