N-(2-(3-Benzyloxy-1,4-dihydro-2-methyl-4-oxo-1-pyridinyl)ethyl)-2,3-dihydro-5-hydroxy-4,6,7-trimethylbenzofuran-2-acetamide 以94%的产率得到N-(2-(1,4-Dihydro-3-hydroxy-2-methyl-4-oxo-1-pyridinyl)ethyl)-2,3-dihydro-5-hydroxy-4,6,7-trimethylbenzofuran-2-acetamide