To a solution of product from Example 12 (210 mg, 0.65 mmol) in dimethylformamide (6 ml) was added 1-hydroxybenzotriazol (105 mg, 0.78 mmol), 1-[3-(dimethylamino)propyl]-3-ethylcarbodimide hydrochloride (173 mg, 0.90 mmol), and N-methylmorpholine (0.106 mmol, 0.97 mmol) and the resulting mixture was stirred for 1 hour at room temperature. A 50% aqueous solution of hydroxylamine (0.119 ml, 1.94 mmol) was added and the mixture was stirred for 15 hours at room temperature. The reaction mixture was concentrated in vacuo, diluted with water, and extracted with ethyl acetate. The organic layer was washed with 1N hydrochloric acid, water, saturated sodium bicarbonate, saturated sodium chloride and dried over anhydrous sodium sulfate. Removal of the solvent in vacuo gave 100 mg (45%) of the product.
