Gold-catalyzed cyclization of tert-butyl allenoate: general synthesis of 2,4-functionalized butenolides
2005
Abstract AuCl 3 efficiently catalyzes cyclization of tert -butyl allenoates into γ-butenolides. Advantage of directly using allenic ester precursor instead of corresponding acid is demonstrated in the synthesis of a variety of 2,4-disubstituted butenolides. A low catalyst loading and mild reaction condition makes this process an attractive alternative over conventional methods using strong Lewis acids.
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