Versatilechiralbuildingblocks for the construction of chiral natural products bearing a secondarymethylgroup have been efficiently prepared from (S)-O-benzylglycidol.
The Regio‐ and Stereospecific Intermolecular Dehydrative Alkoxylation of Allylic Alcohols Catalyzed by a Gold(I) N‐Heterocyclic Carbene Complex
作者:Paramita Mukherjee、Ross A. Widenhoefer
DOI:10.1002/chem.201203987
日期:2013.3.4
AgClO4 catalyzes the intermolecular dehydrative alkoxylation of primary and secondaryallylic alcohols with aliphatic primary and secondary alcohols to form allylic ethers. These transformations are regio‐ and stereospecific with preferential addition of the alcohol nucleophile at the γ‐position of the allylic alcohol syn to the departing hydroxyl group and with predominant formation of the E stereoisomer
Five-carbon homoallylic and allylic alcohols 4, 5, and 6, potentially useful building blocks for the syntheses of a wide variety of optically active compounds, are prepared from chiral (S)-O-benzylglycidol (1) via the selective formation of the terminal and internal acetylenic intermediates 2 and 3.
Optically active terminal-β,γ-acetylenic alcohol rearranges to β-trideuteriomethyl-α,β-acetylenic alcohol, an useful chiral building block for the synthesis of a variety of natural products, on exposure to potassium t-butoxide in dimethyl sulfoxide-d6.