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Presence of water in the reaction mixture facilitated reduction of palladium(II) acetate and resulted in improved reproducibility of the reactions
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Presence of water in the reaction mixture facilitated reduction of palladium(II) acetate and resulted in improved reproducibility of the reactions.
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Lower yields of diphenyl benzylphosphonate for the reactions of diphenyl H-phosphonate (Table 2, entries 9 and 10) were due to partial hydrolysis of the starting H-phosphonate under the reaction conditions.
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Lower yields of diphenyl benzylphosphonate for the reactions of diphenyl H-phosphonate (Table 2, entries 9 and 10) were due to partial hydrolysis of the starting H-phosphonate under the reaction conditions.
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Typical Procedure for the Preparation of Dinucleoside Benzylphosphonates 2: Pd(OAc)2 (0.05 mmol, Xantphos (0.1 mmol, and N,N-diisopropylethylamine (mmol, were refluxed for ca. 3 h in degassed THF (5 mL) containing H2O (0.025 mmol, To this, separate diastereomers of dinucleoside H-phosphonate 1 (1a or 1b; 0.5 mmol),37 and benzyl bromide (0.75 mmol, dissolved in THF (2 mL, were added and the mixture was heated under reflux for 3 h. After concentration and partition of the reaction mixture between sat. aq NaHCO3 and CH2Cl2, the product was purified by silica gel column chromatography using a stepwise gradient of ethanol (0-5, in CH 2Cl2 containing triethylamine (0.02, Compounds 2 were obtained as off-white solids (purity >98, 1H NMR spectroscopy, Compound 2a: 83% yield from 1a probably RP diastereomer
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