1. Swern oxidation. 2. vinyl MgBr, ZnBr2. NHBoc. O. NH. Cbz. 1. OsO4, NMO, acetone/H2O. 3. (COCl)2, DMSO, Et3N, -78 °C. A. 2. TBDPSCl, imid., DCM.
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