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. Author manuscript; available in PMC: 2013 Sep 21.

Published in final edited form as: J Org Chem. 2012 Sep 6;77(18):8257–8267. doi: 10.1021/jo3015825

¹H NMR spectra revealing the formation of the dihydroquinoline 3a. (A, B) Control experiments performed without (A) 3-butyn-2-one (2a) or (B) N-tosyl-2-aminobenzaldehyde (1a) in the reaction mixture; spectra recorded after 4 h. (C–F) Spectra of the reaction proper after (C) 10 min, (D) 1 h, (E) 3.5 h, and (F) 4 h.

¹H NMR spectra revealing the formation of the dihydroquinoline 3a. (A, B) Control experiments performed without (A) 3-butyn-2-one (2a) or (B) N-tosyl-2-aminobenzaldehyde (1a) in the reaction mixture; spectra recorded after 4 h. (C–F) Spectra of the reaction proper after (C) 10 min, (D) 1 h, (E) 3.5 h, and (F) 4 h.