Synthesis of Activated Alkenylboronates from Acetylenic Esters by CuH-Catalyzed 1,2-Addition/Transmetalation
作者:Bruce H. Lipshutz、Žarko V. Bošković、Donald H. Aue
DOI:10.1002/anie.200804912
日期:2008.12.15
Total Synthesis of Enantiopure Pyrrhoxanthin: Alternative Methods for the Stereoselective Preparation of 4-Alkylidenebutenolides
作者:Belén Vaz、Leticia Otero、Rosana Álvarez、Ángel R. de Lera
DOI:10.1002/chem.201301873
日期:2013.9.23
A new stereocontrolled total synthesis of the configurationally labile C37‐norcarotenoid pyrrhoxanthin in enantiopure form has been completed. A highlystereoselective Horner–Wadsworth–Emmons (HWE) condensation of a C17‐allylphosphonate and a C20‐aldehyde was used as the last conjunctive step. Both a Sonogashira reaction to form the C17‐phosphonate and the final HWE condensation proved to be compatible