Maguire, Nuala M.; Mahon, Mary F.; Molloy, Kieran C., Journal of the Chemical Society. Perkin transactions I, 1991, # 8, p. 2054 - 2056
作者:Maguire, Nuala M.、Mahon, Mary F.、Molloy, Kieran C.、Read, Gordon、Roberts, Stanley M.、Sik, Vladimir
DOI:——
日期:——
Allyl‐Palladium‐Catalyzed α,β‐Dehydrogenation of Carboxylic Acids via Enediolates
作者:Yizhou Zhao、Yifeng Chen、Timothy R. Newhouse
DOI:10.1002/anie.201706893
日期:2017.10.9
highly practical and step‐economic α,β‐dehydrogenation of carboxylic acids via enediolates is reported through the use of allyl‐palladium catalysis. Dianions underwent smooth dehydrogenation when generated using Zn(TMP)2⋅2 LiCl as a base in the presence of excess ZnCl2, thus avoiding the typical decarboxylation pathway of these substrates. Direct access to 2‐enoic acids allows derivatization by numerous
D-galactosamine, a powerful liver toxin. As measured by changes in the levels of plasma alanine aminotransferase (ALT) and aspartate aminotransferase (AST), avocado showed extraordinarily potent liver injury suppressing activity. Five active compounds were isolated and their structures determined. These were all fatty acid derivatives, of which three, namely, (2E,5E,12Z,15Z)-1-hydroxyheneicosa-2,5,12,15-tetraen-4-one