Rr. Cesati et Ja. Katzenellenbogen, Preparation of hexahydrobenzo[f]isoquinolines using a vinylogous Pictet-Spengler cyclization, ORG LETT, 2(23), 2000, pp. 3635-3638
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A vinylogous Pictet-Spengler cyclization has been carried out using activat
ed aldehydes, ketones, and alkynes to prepare a variety of substituted hexa
hydrobenzo[f]isoquinolines. A unique set of conditions was utilized to effe
ct efficient cyclization with acid sensitive electrophiles.