在这里,我们报告说,容易获得的基于甲硅烷基和硼的路易斯酸与手性铜催化剂结合能够克服未活化的烯酰胺(被称为反应性最低的羧酸衍生物)对有机镁试剂进行烷基化的反应性问题。在催化不对称共轭加成到烯酰胺中允许无与伦比的化学反应性和立体控制,该方法以其前所未有的反应范围而著称,即使是最具挑战性和合成上重要的甲基化也能以良好的产率和出色的对映选择性完成。该催化协议可耐受较宽的温度范围(-78 °C 至环境温度)和放大(10 g),而手性催化剂可以重复使用而不会影响整体效率。
在这里,我们报告说,容易获得的基于甲硅烷基和硼的路易斯酸与手性铜催化剂结合能够克服未活化的烯酰胺(被称为反应性最低的羧酸衍生物)对有机镁试剂进行烷基化的反应性问题。在催化不对称共轭加成到烯酰胺中允许无与伦比的化学反应性和立体控制,该方法以其前所未有的反应范围而著称,即使是最具挑战性和合成上重要的甲基化也能以良好的产率和出色的对映选择性完成。该催化协议可耐受较宽的温度范围(-78 °C 至环境温度)和放大(10 g),而手性催化剂可以重复使用而不会影响整体效率。
Visible-light-promoted oxidation/condensation of benzyl alcohols with dialkylacetamides to cinnamides
作者:Tianlong Yang、Maojian Lu、Zhaowei Lin、Mingqiang Huang、Shunyou Cai
DOI:10.1039/c8ob02938e
日期:——
Oxidative cross-coupling reactions of benzylalcohols with N,N-dialkylacetamides were developed only employing oxygen as the terminal oxidant, efficiently providing a new, novel protocol for the construction of multifunctionalized cinnamides with the synergistic effects of KOH, organic photocatalyst eosin Y, and visible light irradiation at room temperature. A broad substrate scope and mild reaction
Salts And Co-Crystals of Pyrazolopyrimidine Compounds, Compositions Thereof And Methods For Their Production And Use
申请人:LIPPA S. Arnold
公开号:US20080045547A1
公开(公告)日:2008-02-21
The invention provides pharmaceutically acceptable salts and co-crystals of pyrazolopyrimidine compounds such as zaleplon, indiplon and ocinaplon, processes for their preparation, compositions comprising such salts and co-crystals and methods of using such salts and co-crystals for treating various diseases and conditions.
Copper-catalyzed synthesis of α,β-unsaturated acylamides via direct amidation from cinnamic acids and N-substituted formamides
作者:Hong Yan、Hailong Yang、Linhua Lu、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1016/j.tet.2013.06.078
日期:2013.9
A highly effective synthesis of α,β-unsaturated acylamides is reported for the first time via copper-catalyzed direct amidation between readily available cinnamic acids and N-substituted formamides. The protocol was easily accessible and practical.
A facile and convenient protocol for the synthesis of cinnamides from cinnamic acids and tetraalkylthiuram disulfides under metal and additive free conditions has been achieved. This method allows the efficient coupling of diverse cinnamic acids with tetraalkylthiuram disulfides through a simply mixing operation.