carbonic acid di-pyridin-2-yl ester; 4-(N,N-dimethlyamino)pyridine in dichloromethane 1 h; Ambient temperature;

1: 1) butyllithium / 1) THF, hexane, -70 deg C, 0.5 h, 2) -70 deg C, 0.5 h, 3) room temp. 2: 1) dicyclohexylborane, 2) 30percent H2O2, N,N,N',N'-tetramethylethylenediamine, 3 M aq. NaOH View Scheme

sodium hydroxide; N,N,N',N,-tetramethylethylenediamine; bis(cyclohexanyl)borane; dihydrogen peroxide Yield given. Multistep reaction. Yields of byproduct given;

(i) 2-fluoro-1-methyl-pyridinium toluene-4-sulfonate, nBu3N, (ii) /BRN= 1730908/, nBu3N; Multistep reaction;