2,6,7,8-Tetramethyl-3-ethylindolo<3,2-d>thiazolium iodide 、
2-[(E)-2-(Acetyl-phenyl-amino)-vinyl]-1-ethyl-4,5,6-trimethyl-4H-thiazolo[5,4-b]indol-1-ium; iodide 在
乙酸酐 、
三乙胺 作用下,
以60%的产率得到1-Ethyl-2-{(E)-3-[1-ethyl-4,5,6-trimethyl-1,4-dihydro-thiazolo[5,4-b]indol-(2E)-ylidene]-propenyl}-4,5,6-trimethyl-4H-thiazolo[5,4-b]indol-1-ium; iodide