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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Bioorg Med Chem. 2013 Mar 5;21(17):5629–5646. doi: 10.1016/j.bmc.2013.02.016

Scheme 8.

Scheme 8

(a) i, (BnO)2PN(iPr)2, ii, MCPBA, iii, H2, Pd/C, iv, aq TFA; (b) i, 2-picoline borane, 8, ii, H2, Pd/C; (c) i, 2-picoline borane, 70, ii, 6M aq HCl.