boron trifluoride diethyl etherate in dichloromethane 18 h;
参考文献
Banerji, J.; Saha, M.; Chakrabarti, R.; Das, A. K.; Pandit, U. K.; et al.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1986 , vol. 25, p. 1204 - 1208