J. Schkeryantz, J. C. Woo, P. Siliphaivanh
Dec 9, 1999
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0
Influential Citations
132
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Journal
Journal of the American Chemical Society
Abstract
A concise and efficient total synthesis of the acyl-CoA:cholesterol acyltransferase inhibitor gypsetin (1) is described. The route features a straightforward method for the introduction of a reverse prenyl group into the C2-position of an N-phthaloyl-protected tryptophan (11). The total synthesis of gypsetin was completed by the dimethyldioxirane-promoted double-oxidative cyclization of a prefashioned diketopiperazine (19). Total syntheses of deoxybrevianamide E (24) and brevianamide E (25) following similar procedures are also described. The reaction of nucleophiles with in situ-generated 3-chloroindolenines provides a route to 2,3-disubstituted indoles from 3-substituted precursors. Indications of the scope and limitations of such reactions are provided. A total synthesis of tryprostatin B (41), a diketopiperazine derived from an l-tryptophan derivative (bearing a prenyl group at the α position of the indole) and l-proline, was accomplished. The key step involved the introduction of the prenyl function ...