Reaction Steps
(5S,8S,11S,14S,20S,23S,26S,29R)-8-Benzyl-23-(tert-butoxymethyl)-26-((S)-sec-butyl)-14-((R)-1-hydroxyethyl)-11,20-diisobutyl-4,5,7,10,16,19,25-heptamethyl-29-(piperidine-1-carbonyl)-1-thia-4,7,10,13,16,19,22,25,28-nonaazacyclotriacontane-3,6,9,12,15,18,21,24,27-nonone (9.6 mg, 8.19×10−3 mmol) was dissolved in methanol (0.6 ml), and water (0.3 ml) was added. While stirring the solution, oxone (15.1 mg, 2.46×10−2 mmol) was added. The reaction mixture was stirred at room temperature for 14 hours, and DMSO (80 μl) was then added. The mixture was purified by reverse-phase silica gel column chromatography (10 mM aqueous ammonium acetate solution/methanol=60/40→0/100) to afford 5S,8S,11S,14S,20S,23S,26S,29R)-8-benzyl-23-(tert-butoxymethyl)-26-((S)-sec-butyl)-14-((R)-1-hydroxyethyl)-11,20-diisobutyl-4,5,7,10,16,19,25-heptamethyl-29-(piperidine-1-carbonyl)-1-thia-4,7,10,13,16,19,22,25,28-nonaazacyclotriacontane-3,6,9,12,15,18,21,24,27-nonaone 1,1-dioxide (8.3 mg, 84%).
