Lithium enolates generated from t-butyl esters of δ-hydroxy carboxylic acids with lithium dialkylamides in THF–HMPA were alkylated stereoselectively to give the corresponding syn-α-alkylated δ-hydroxy esters. The generation of the enolates was accelerated by the addition of lithium trifluoromethanesulfonate, and the successive aldol and hydroxylation reactions of the enolates also proceeded in a stereoselective manner.
Remote Control of Regio- and Diastereoselectivity in the Hydroformylation of Bishomoallylic Alcohols with Catalytic Amounts of a Reversibly Bound Directing Group
作者:Christian U. Grünanger、Bernhard Breit
DOI:10.1002/anie.200905949
日期:2010.1.25
Remote and reversible! Phosphinites serve as reversiblybounddirectinggroups for the remotecontrol of the regio‐ and diastereoselectivehydroformylation of bishomoallylicalcohols (see scheme; r.r: regioisomer ratio). The distance between the double bond and the functional hydroxy group to which the directinggroup is reversiblybound is the longest ever reported.
Palladium-catalysed conversion of alkenols into five- and six-membered ring lactones at room temperature and atmospheric pressure
作者:Howard Alper、Danielle Leonard
DOI:10.1039/c39850000511
日期:——
Unsaturated alcohols react with carbon monoxide, oxygen, palladium chloride, copper(II) chloride, and hydrochloric acid in tetrahydrofuran to give lactones in 42–80% yield.
Natural product synthesis using π-allyltricarbonyliron lactone complexes: Synthesis of parasorbic acid, the carpenter bee pheromone and malyngolide
作者:Averil M. Horton、Steven V. Ley
DOI:10.1016/0022-328x(85)87394-0
日期:1985.4
Preparation of three δ-lactonic natural products, parasorbic acid, the carpenter bee pheromone and malyngolide has been achieved fromπ-allyltricarbonylironlactonecomplexes as the key synthetic intermediates.
Stereocontrolled synthesis of (R*R*)- and (R*S*)-5-hydroxy-2-methylhexanoic acid lactones
作者:J.E. Bäckvall、S.E. Byström、Nyström J.E.
DOI:10.1016/s0040-4020(01)91414-0
日期:1985.1
(E,Z)-2,4-Hexadiene was transformed to the lactone cis-1 ( ⪢ 93% cis)(pheromone of the carpenterbee) in a stereospedfic reaction sequence via a Pd-calalyzed 1,4-acetoxychlorination. The same reaction sequence applied to (E,E)-2,4-hexadiene afforded the isomeric lactone trans-1 (⪢91% trans).