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Synthesis of the branched arabinofuranose fragment using a six component one-pot synthesis. i) TTBP, 4 Å MS, DCM, pTolSCl, AgOTf then 143, −78 °C to room temperature. ii) pTolSCl, AgOTf then 144, −78 °C to room temperature. iii) pTolSCl, AgOTf then 144, −78 °C to room temperature.
