tert-butyl ((2S,3R)-1-((2S,4R)-2-(((1R,2S)-1-((cyclopropylsulfonyl)carbamoyl)-2-vinylcyclopropyl)carbamoyl)-4-hydroxypyrrolidin-1-yl)-3,5-dimethyl-1-oxonon-8-en-2-yl)carbamate → tert-Butyl ((2R,6S,7R,13 aS,14aR,16aS,Z)-14a-((cyclopropylsulfonyl)carbamoyl)-2-hydroxy-7,9-dimethyl-5,16-dioxo-1,2,3,5,6,7,8,9,10,11,13a,14,14a,15,16,16a-hexadecahydrocyclopropa[e]pyrrolo[1,2-a][1,4]diazacyclopentadecin-6-yl)carbamate

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A solution of tert-butyl ((2S,3R)-1-((2S,4R)-2-(((1R,2S)-1-((cyclopropylsulfonyl)carbamoyl)-2-vinylcyclopropyl)carbamoyl)-4-hydroxypyrrolidin-1-yl)-3,5-dimethyl-1-oxonon-8-en-2-yl)carbamate (9.50 g, 15.2 mmol) in DCE (2.5 L) was sparged with nitrogen for 30 min. To the solution was added Hoveyda-Grubbs 2nd Generation Catalyst (0.574 g, 0.912 mmol). The solution was heated at 80° C. for 2 h; then cooled to 45° C. and stirred for 2 days. The reaction solution was concentrated in vacuo and the resulting solid residue was then subjected to flash chromatography on silica gel (hexanes:acetone, 80:20 to 40:60) to afford tert-butyl ((2R,6S,7R,13aS,14aR,16aS,Z)-14a-((cyclopropylsulfonyl)carbamoyl)-2-hydroxy-7,9-dimethyl-5,16-dioxo-1,2,3,5,6,7,8,9,10,11,13a,14,14a,15,16,16a-hexadecahydrocyclopropa[e]pyrrolo[1,2-a][1,4]diazacyclopentadecin-6-yl)carbamate as a solid foam (7 g). MS: MS m/z 597.35 (M++1).

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