Chemistry Letters p. 229 - 230 (1981)
Update date:2022-09-26
Topics:
Yamaoka, Hiroshi
Kashiwagi, Kouichi
Hanafusa, Terukiyo
The reactions of the methylenehomochromene (titled compound) (1) with orthoformates (2a,b) or acetals (2c-f) easily took place in the presence of anhydrous zinc chloride to give 5-alkoxyethyl-2,3-dihydro-1-benzoxepin derivatives (3a-f) in moderate to good yields.Unusually high reactivity of 1 may be due to homoaromatic stabilization in the reaction intermediate.
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