吗啉 、
8,8-Dioxo-4-(3,3,6,6-tetramethyl-1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1H-xanthen-9-yl)-7-oxa-8λ6-thia-bicyclo[4.2.0]octa-1(6),2,4-triene-3-sulfonyl chloride 以
甲醇 为溶剂,
以45%的产率得到3,3,6,6-Tetramethyl-9-[3-(morpholine-4-sulfonyl)-8,8-dioxo-7-oxa-8λ
6-thia-bicyclo[4.2.0]octa-1(6),2,4-trien-4-yl]-3,4,5,6,7,9-hexahydro-2H-xanthene-1,8-dione