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
Radicicol derivatives, their preparation and their anti-tumor activity
申请人:Sankyo Company, Limited
公开号:US05597846A1
公开(公告)日:1997-01-28
A compound of the formula ##STR1## in which: R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen atoms and groups of formula R.sup.3 --CO--, wherein R.sup.3 represents a group selected from the group consisting of unsubstituted alkyl groups having from 9 to 20 carbon atoms; substituted alkyl groups having from 10 to 20 carbon atoms; unsubstituted alkenyl groups having from 9 to 20 carbon atoms; substituted alkenyl group having from 10 to 20 carbon atoms; unsubstituted alkynyl groups having from 8 to 10 carbon atoms; and substituted alkynyl groups having from 8 to 10 carbon atoms wherein R.sup.1 and R.sup.2 are not both hydrogen atoms or acetyl groups. The compounds have antitumor activity.