Tetrahedron Letters p. 4109 - 4112 (1990)
Update date:2022-08-30
Topics:
Murray, Desmond H.
Albizati, Kim F.
Trialkylsilyloxyallyl cations 2 with a ?-donating methoxy substituent at the allylic termini are generated from nonhalogenated substrates via treatment of 5b-e with Lewis acids. 2 undergoes stereo- and regioselective cycloaddition with furans yielding 2-methoxy-8-oxabicyclo<3.2.1>oct-6-en-3-ones.Cycloadduct 7 is converted to 2-methoxytropone 14 and thus represents an efficient entry into tropolonoid systems.
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