2-(2,3-dihydro-5-hydroxy-4,6,7-trimethylbenzofuran-2-yl)ethyl 3-(3-benzyloxy-1,4-dihydro-2-methyl-4-oxo-1-pyridinyl)propanoate 以85%的产率得到2-(2,3-Dihydro-5-hydroxy-4,6,7-trimethylbenzofuran-2-yl)ethyl 3-(1,4-dihydro-3-hydroxy-2-methyl-4-oxo-1-pyridinyl)propanoate