3-cyclopentyl-5-ethoxy-1,3-dihydro-2H-benzimidazol-2-one 、
methyl 4-(chlorosulfonyl)-3-methoxybenzoate 在
silica 、
ethyl acetate dichloromethane 作用下,
以to give 1.4 g of the expected product的产率得到Methyl 4-[3-cyclopentyl-5-ethoxy-2,3-dihydro-2-oxo-1H-benzimidazol-1-yl]sulfonyl-3-methoxybenzoate