2-[5-(1-ethyl-1,3-dihydro-5-acetylamino-3,3-dimethyl-2H-indol-2-ylidene)-1,3,5-heptatrien-1-yl]-1-ethyl-5-acetylamino-3,3-dimethyl-3H-indolium iodide 在
boron trifluoride methanol complex 作用下,
以
甲醇 为溶剂,
以74%的产率得到2-[5-(1-ethyl-1,3-dihydro-5-amino-3,3-dimethyl-2H-indol-2-ylidene)-1,3,5-heptatrien-1-yl]-1-ethyl-5-amino-3,3-dimethyl-3H-indolium iodide