The first total synthesis of the unsymmetrical bis-macrolide (-)-colletol is described. The synthesis involves a Lewis acid mediated addition of triphenylallylstannane to aldehyde 14 to set the C12 stereochemistry. The penultimate step utilized macrolactonization to assemble the 14-membered ring. The natural product was prepared in 12 linear steps and 12% overall yield.
The total synthesis of (10S,12S)-10-hydroxy-12-methyl-1-oxacyclododecane-2,5-dione is described proving the versatility of the Prins cyclization in natural products synthesis. The approach is convergent and highly stereoselective. Prins cyclization, esterification, ring-closingmetathesis and oxidation reactions are utilized as keysteps in the synthesis of this macrolactone. Prins cyclization - esterification
The stereoselective total synthesis of xestodecalactone C and epi-sporostatin via the Prins cyclisation
作者:J.S. Yadav、N. Thrimurtulu、K. Uma Gayathri、B.V. Subba Reddy、A.R. Prasad
DOI:10.1016/j.tetlet.2008.08.096
日期:2008.11
Syntheses of xestodecalactoneC and epi-sporostatin are described utilising Prins cyclisations, Mitsunobu reaction and intramolecular Friedel–Crafts acylation. The approach is convergent and highly stereoselective.
A simple and efficient total synthesis of five-membered pyrrolidine, (+)-pseudohygroline is described. The key steps involved in this synthesis are highly stereoselective Prins cyclisation followed by reductive ring opening and hydroboration. (C) 2010 Elsevier Ltd. All rights reserved.