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a Reaction conditions: a) R-B(OH)2, Na2CO3, Pd(OAc)2, TPPTS, H2O/MeCN, 100 °C, 1 h; b) isopentylnitrite, CuI, I2, CH2I2, THF, 80 °C, 45 min; c) 75% TFA, 22 °C, 1 h; d) 1: methylene bis(phosphonic dichloride), PO(OMe)3, 0 °C, 3 h; 2: H2O, 22 °C, 1 h.
