4-ethyl-3-oxobis[1,2]dithiolo[3,4:4',3'-e][1,4]thiazine-5-thione 、
1,4-bis(5-hydroxymethyl-2-furyl)but-2-yne-1,4-dione 在
scandium tris(trifluoromethanesulfonate) 作用下,
以
二氯甲烷 为溶剂,
反应 0.17h,
以84%的产率得到3-oxo-4-ethyl-5-[4,5-bis(5-hydroxymethyl-2-furoyl)-1,3-dithiol-2-ylidene]-[1,2]dithiolo[3,4-b][1,4]thiazine-6-thione