Selective One-Pot Synthesis of Allenyl and Alkynyl Esters from β-Ketoesters
作者:Pradip Maity、Salvatore D. Lepore
DOI:10.1021/jo801563x
日期:2009.1.2
β-ketoesters to generate conjugated and deconjugated alkynyl esters and conjugated allenyl esters. This sequential one-pot method involves the formation of a vinyl triflate monoanion intermediate that leads to the selective formation of alkynes or allenes depending on additives and conditions used. Product outcomes appear to be a function of unique mono- and dianion mechanisms which are described.
Enantio and Diastereoselective Addition of Phenylacetylene to Racemic α-chloroketones
作者:Silvia Alesi、Enrico Emer、Montse Guiteras Capdevila、Diego Petruzziello、Andrea Gualandi、Pier Giorgio Cozzi
DOI:10.3390/molecules16065298
日期:——
In this report, we have presented the first diastereoselective addition of phenylacetylene to chiral racemic chloroketones. The addition is controlled by the reactivity of the chloroketones that allowed the stereoselective reaction to be performed at -20 °C. Chiral racemic chloroketones are used in the reaction. By carefully controlling the temperature and the reaction time we were able to isolate
在本报告中,我们首次展示了苯乙炔与手性外消旋氯酮的非对映选择性加成。添加量由氯酮的反应性控制,允许立体选择性反应在 -20 °C 下进行。反应中使用手性外消旋氯酮。通过仔细控制温度和反应时间,我们能够以中等产量和良好、简单和可预测的面部立体选择分离出相应的产品。我们的反应是在对映选择性炔基化反应中使用手性酮的罕见例子,并为手性四元立体中心的形成开辟了新的视角。
The total synthesis of (±) - ptilocaulin
作者:Barry B. Snider、William C. Faith
DOI:10.1016/s0040-4039(00)81549-x
日期:1983.1
α-Halocarbonyl compounds, I. An efficient preparation of α-bromoesters and α-bromoacids