Pure Appl. Chem., 1994, Vol. 66, No. 10-11, pp. 2163-2166
http://dx.doi.org/10.1351/pac199466102163
N-acyliminium ion cyclisations in natural product chemistry: Synthesis of gelsemine
First page:

Pure Appl. Chem., 1994, Vol. 66, No. 10-11, pp. 2163-2166
http://dx.doi.org/10.1351/pac199466102163