sodium hydride in dichloromethane; N,N-dimethyl-formamide 15 h; with 100 mole percent of base; Title compound not separated from byproducts;

1: 98 percent / pyridine / 1) 0 deg C, 2) 2 h, R. T. 2: 46 percent / 50 percent NaH / dimethylformamide; CH2Cl2 / 15 h / with 100 mole percent of base View Scheme

1: 98 percent / pyridine / 1) 0 deg C, 2) 2 h, R. T. 2: 46 percent / 50 percent NaH / dimethylformamide; CH2Cl2 / 15 h / with 100 mole percent of base View Scheme