Scheme 5. Preparation of Direct Radiolabeling Precursor 34a.
aReagents and conditions: (a) (CH2OTs)2, K2CO3, MeCN; (b) (i) DIPEA, 1,2-DCE/MeOH; (ii) NaBH(OAc)3, AcOH, 1,2-DCE.
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