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Silver(I)-Catalyzed Novel Cascade Cyclization Reactions:  Incorporation of Allenes into the Isochromenes

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journal contribution
posted on 25.11.2005, 00:00 by Nitin T. Patil, Nirmal K. Pahadi, Yoshinori Yamamoto
The silver(I)-catalyzed reaction of alkynones with alcohols represents a general tool for the synthesis of 1-allenyl isochromenes. The reaction most probably proceeds via the formation of benzopyrylium cation, which subsequently undergoes nucleophilic attack of an alcohol to give the annulation products.