Highly Efficient and Diastereoselective Synthesis of (+)-Lineatin
摘要:
A linear sequence was used to synthesize (+)-lineatin in 14 steps and 14% overall yield from a homochiral 2(5H)-furanone. Key steps of this synthetic approach feature the diastereoselective construction of a cyclobutene through a photochemical [2 + 2] cycloaddition and a regiocontrolled oxymercuration reaction.
Highly Efficient and Diastereoselective Synthesis of (+)-Lineatin
摘要:
A linear sequence was used to synthesize (+)-lineatin in 14 steps and 14% overall yield from a homochiral 2(5H)-furanone. Key steps of this synthetic approach feature the diastereoselective construction of a cyclobutene through a photochemical [2 + 2] cycloaddition and a regiocontrolled oxymercuration reaction.
Photochemical Cycloaddition of Mono-, 1,1-, and 1,2-Disubstituted Olefins to a Chiral 2(5<i>H</i>)-Furanone. Diastereoselective Synthesis of (+)-Lineatin
作者:Marta Racamonde、Ramon Alibés、Marta Figueredo、Josep Font、Pedro de March
DOI:10.1021/jo800970u
日期:2008.8.1
The photochemical [2 + 2] cycloaddition of (S)-4-methyl-5-O-pivaloyloxymethyl-2(5H)-furanone, 5, to vinyl acetate, vinyl pivalate, tert-butyl vinyl ether, 1,1-diethoxyethylene, and (Z)- and (E)-1,2-dichloroethylene has been studied. A practical synthesis of (+)-lineatin from 5 has been developed via the functionalized cyclobutane 6.
Photocycloaddition of (Z)-1,2-dichloroethylene to enantiopure 2(5H)-furanones: an efficient strategy for the diastereoselective synthesis of cyclobutane and cyclobutene derivatives
作者:Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font、Marta Racamonde、Albert Rustullet、Angel Alvarez-Larena、Juan F. Piniella、Teodor Parella
DOI:10.1016/s0040-4039(02)02528-5
日期:2003.1
A highly stereoselective and efficient synthetic approach to cyclobutane and cyclobutene derivatives has been developed consisting of a [2+2] photochemical cycloaddition of chiral 2(5H)-furanones to (Z)-1,2-dichloroethylene followed by dihydrodehalogenation or dihaloelimination.
Photochemical [2 + 2] Cycloaddition of Acetylene to Chiral 2(5<i>H</i>)-Furanones
作者:Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font、Xiaolin Fu、Marta Racamonde、Ángel Álvarez-Larena、Juan F. Piniella
DOI:10.1021/jo0264731
日期:2003.2.1
The [2 + 2] photocycloaddition of acetylene to chiral 2(5H)-furanones was investigated. The influence on the chemical yield and facial diastereoselectivity of the substituent at the stereogenic center and also the effect of a 4-methyl group were evaluated. A mechanistic proposal based on a simple theoretical conformational analysis is presented. Using a C(2)-symmetric bis(lactone) as the substrate