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. Author manuscript; available in PMC: 2010 Sep 2.
Published in final edited form as: Mol Biosyst. 2010 Jun 28;6(8):1389–1402. doi: 10.1039/c003917a

Scheme 5.

Scheme 5

(a) R2B(OH)2, Pd(dba)2, K3PO4, Q-Phos, toluene, 100 °C, 2.5 h, (b) H2, Pd/C, EtOH, rt, over night, (c) Br2, AcOH, 0 °C, 1 h, yield: 24–63% for 3 steps, (d) NaNO2, HCl, H2O, −20 °C, 30 min, then tBuSH, 0 °C, 1 h, (e) tBuOK, DMSO, rt, over night, yield: 48–81% for 2 steps.