(R)-N-[2,4-dioxo-6-(tetrahydro-furan-2-yl)-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl]-methanesulfonamide 、
氯甲酸异丁酯 以to yield methanesulfonyl-N—((R)-2,4-dioxo-6-tetrahydro-furan-2-yl-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl)-carbamic acid isobutyl ester的产率得到methanesulfonyl-N-((R)-2,4-dioxo-6-tetrahydro-furan-2-yl-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl)-carbamic acid isobutyl ester