Scheme 367. Expanded Carbaporphyrins Incorporating Aza-[5]helicene Motifs.
Reagents and conditions: (a)705 (1) p-nitrobenzaldehyde, BF3·OEt2, CHCl3, 2 h, (2) DDQ, 10 min; (b) BF3·OEt2, toluene, triethylamine, reflux, 90 min, (2) triethylamine.
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