Modular Approach to the Synthesis of Unsaturated 1-Monoacyl Glycerols
作者:David J. Hart、Bridgett E. Coleman、Valerie Cwynar、Fabien Havas、Jakkam Madan Mohan、Suzanne Patterson、Sam Ridenour、Michael Schmidt、Eboney Smith、Angela J. Wells
DOI:10.1055/s-2004-825616
日期:——
A modular synthesis of unsaturated 1-monoacylglycerols (1) from cis-1-iodo-1-alkenes [cis-RCH=CHI] and unsaturated carboxylic acids [CH2=CH(CH2)nCO2H] is described. The method revolves around a Suzuki coupling to establish olefin geometry.
Synthesis of three potential inhibitors of the biosynthesis of leukotrienes A–E
作者:E.J. Corey、Hokoon Park、Alan Barton、Yasushi Nii
DOI:10.1016/s0040-4039(00)92873-9
日期:1980.1
Simple synthetic routes are described to 5,6-dehydroarachidonic acid (5) cis-8-eicosen-5-ynoic acid 6) and the thio analog of (±)-leukotriene A (7), which are of value in the study of inhibition of the biosynthesis of leukotrienes and slow reacting substances.
The stereocontrolledsynthesis of a racemic carboxylic acid of crambescin B, a marine alkaloid, is described. The synthesis features two highly stereoselective reactions: (i) palladium-catalyzed hydroxymethylation of an alkynyl aziridine having an N-guanidino group and (ii) cascade bromocyclization providing a spiro-hemiaminal structure. The cell-based colorimetric assay showed that the synthesized
Assembly of Conjugated Enynes and Substituted Indoles via CuI/Amino Acid-Catalyzed Coupling of 1-Alkynes with Vinyl Iodides and 2-Bromotrifluoroacetanilides
作者:Feng Liu、Dawei Ma
DOI:10.1021/jo070547x
日期:2007.6.1
Cross-coupling of 1-alkynes with vinyl iodides occurs at 80 degrees C in dioxane catalyzed by CuI/N,N-dimethylglycine to afford conjugated enynes in good to excellent yields. Heating a mixture of 2-bromotrifluoroacetanilide, 1-alkyne, 2 mol % of CuI, 6 mol % of L-proline, and K2CO3 in DMF at 80 degrees C leads to the formation of the corresponding indole. This conversion involves a CuI/L-proline-catalyzed coupling between aryl bromide and the 1-alkyne followed by a CuI-mediated cyclization process. An ortho-substituent effect directed by NHCOCF3 enables the reaction to proceed under these mild conditions. Both aryl acetylenes and O-protected propargyl alcohol can be applied, leading to 5-, 6-, or 7-substituted 2-aryl and protected 2-hydroxymethyl indoles in good yields. With simple aliphatic alkynes, however, lower yields were observed.