New Intramolecular Five-Endo-Mode Cyclization of Allenyl Aryl Ketones.
Y Nagao, WS Lee, K Kim
Index: Nagao, Yoshimitsu; Lee, Woo-Song; Kim, Kweon Chemistry Letters, 1994 , # 2 p. 389 - 392
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Citation Number: 20
Abstract
A convenient preparation of allenyl aryl ketones was achieved by the Weinreb-modified Grignard reaction of N-methoxy-N-methylamides with propargylmagnesium bromide. On treatment with BF 3· OEt 2, the allenyl aryl ketones were converted to methylenebenzocyclopetenones via a new 5-endo-mode cyclization.
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