"One-pot" DCC (1.5 equiv) CH2CI2 (2mL) rt, 2h CF3CH,OH (4mL) Phl(OAc)2 (1.0 equiv) 5 minutes OH B Но NBoc D HN. `R1 R OHC CF3SO3H (2.0 equiv) 5 minutes A (1.5 equiv) R2 (2.0 equiv) H20 (5 mL) then aldehyde, 24h

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