4-ethyl-1H,2H,3H,3aH,4H,8bH-cyclopenta[b]indole-7-carbaldehyde 、
3-(2-carboxyethyl)-2-methylbenzo thiazol-3-ium iodide 在
ammonium acetate 、
溶剂黄146 作用下,
反应 2.0h,
以54.4%的产率得到3-[2-[(E)-2-(4-ethyl-2,3,3a,8b-tetrahydro-1H-cyclopenta[b]indol-7-yl)ethenyl]-1,3-benzothiazol-3-ium-3-yl]propanoic acid;iodide