Scheme 7.
Reagents and conditions: (a) LiAlH4 (88%); (b) NaHCO3, (Boc)2O (88%); (c) oxalyl dichloride, DMSO, DIEA (71%); (d) 34 or 61, NaBH4 (54%–60%); (e) TFA/H2O (9:1) (74%–86%).
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