反应详情

The title compound is prepared by the procedure of Example 124 using 4.6 g of product from Example 130, 4.73 g of 4-nitrobenzyl chloroformate, 2.7 mlof Hunig's base, 25 ml of methylene chloride and 7 ml of tetrahydrofuran togive 2,035 g of the desired product after chromatography (silica gel: 75% ethyl acetate/hexane).