Journal
ORGANIC LETTERS
Volume 5, Issue 22, Pages 4117-4120Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol035652h
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[GRAPHIC] The mechanism for the Lewis acid-catalyzed [4 + 3] cycloaddition of 2-(trimethylsilyloxy)acrolein 1 with furan 2 has been studied at the B3LYP/6-31G* level. This reaction is a three-step process that is initialized by the nucleophilic attack of 2 to the beta-conjugated position of 1 to give a zwitterionic intermediate IN1. The key step on the formation of the seven-membered ring is the electrophilic attack of the furan residue to the electrophilically activated carbonyl carbon at this intermediate.
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