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a Reaction conditions: a) TBN, 70% HF·Py, – 30 °C, 30 min b) R-B(OH)2, Na2CO3, Pd(OAc)2, TPPTS, H2O/MeCN, 80–100 °C, 1 h. c) 1: methylene bis(phosphonic dichloride), PO(OMe)3, 0 °C, 3 h; 2: H2O, 22 °C, 1 h.
