A facile and stereoselective synthesis of dienediones and 6-oxo-2,4-dienoic esters
摘要:
Ostopanic acid and ethyl 6-oxodocosa-2,4-dienoate were synthesized by a short route based on the palladium catalyzed isomerization of ynone and ynoic ester, respectively, using pent-4-ynal as a starting material.
N-Vinylpyridinium tetrafluoroborate salts as reagents for the stereoselective and regioselective synthesis of symmetrical (2E,4E)-1,6-dioxo-2,4-dienes
作者:Ge Gao、Neil Brown、Machiko Minatoya、Keith R. Buszek
DOI:10.1016/j.tetlet.2008.08.076
日期:2008.11
in Pd(0)-catalyzed Suzuki cross-couplingreactions with aryl and vinyl boronic acids. We now report that these crystalline, air-stable, and non-hygroscopic salts are also useful reagents for the synthesis of symmetrical (2E,4E)-1,6-dioxo-2,4-dienes (diene diones), which in turn are valuable starting materials for the synthesis of various five-membered heterocycles. The optimization of reaction conditions