通过气相色谱分析随后分离的阿魏木霉菌株11的发酵肉汤,然后使用Finnigan MAT GCQ仪器进行质谱检测。在C18和硅胶柱中进行预分离后,分别获得十九个吡喃酮和二氧戊环衍生物以及两种脂族酯。其中,四种二氧戊环衍生物先前尚未鉴定。发现主要成分为5,5'-二甲基-2H-吡喃-2-on。用于确定保留时间和峰面积(以离子数测量)的相对标准偏差分别为0.1%和4.5%。
Zirconocene-catalyzed sequential ethylcarboxylation of alkenes using ethylmagnesium chloride and carbon dioxide
作者:Peng Shao、Sheng Wang、Chao Chen、Chanjuan Xi
DOI:10.1039/c5cc01153a
日期:——
The zirconocene-catalyzed sequential ethylcarboxylation of alkenes using ethylmagnesium chloride and carbon dioxide has been developed. A range of alkenes were transformed into the corresponding carboxylic acids in high yields.
Substituted 4,10-dihydro-10-oxothieno benzoxepins and intermediates thereof, a process for their preparation and their use as medicaments
申请人:HOECHST-ROUSSEL
PHARMACEUTICALS INCORPORATED
公开号:EP0120304A2
公开(公告)日:1984-10-03
The present invention relates to substitued 4,10-dihydro-10-oxothieno-benzoxepins of the formula
where R is hydrogen or loweralkylcarbonyl; and R' and R2 are each independently hydrogen or loweralkyl, which are useful as anti-inflammatory and analgetic agents, a process fortheir preparation and intermediate compounds therefor. Said compounds exhibit an advantageous prolonged duration of action and low gastric irritation properties.
本发明涉及 4,10-二氢-10-氧代噻吩基苯并氧杂卓(4,10-dihydro-10-oxothieno-benzoxepins),其式为
其中 R 为氢或低级烷基羰基;R'和 R2 各自独立地为氢或低级烷基,可用作消炎药和镇痛药,还涉及其制备方法及其中间化合物。上述化合物具有作用时间长、胃刺激性低的优点。
Catalytic Regio- and Enantioselective Remote Hydrocarboxylation of Unactivated Alkenes with CO2
The catalytic regio- and enantioselective hydrocarboxylation of alkenes with carbon dioxide is a straightforward strategy to construct enantioenriched α-chiral carboxylic acids but remains a big challenge. Herein we report the first example of catalytic highly enantio- and site-selective remote hydrocarboxylation of a wide range of readily available unactivated alkenes with abundant and renewable CO2
烯烃与二氧化碳的催化区域和对映选择性加氢羧化是构建对映体富集的 α-手性羧酸的简单策略,但仍然是一个巨大的挑战。在此,我们报告了在 SaBOX/Ni 催化剂的温和条件下,利用丰富且可再生的 CO 2对各种容易获得的未活化烯烃进行高度对映和位点选择性远程加氢羧化的催化例子。这一成功的关键是利用手性 SaBOX 配体,它与镍结合,同时控制链行走和羧化的对映选择性。该方法以高产率和区域选择性和对映选择性直接提供一系列带有各种官能团的不同烷基链取代或苯并稠合的 α-手性羧酸。此外,通过从商业起始材料中简明合成抗血小板聚集药物( R )-吲哚布芬,证明了该方法的合成效用。