Comparison of Base‐Promoted and Self‐Catalyzed Conditions in the Synthesis of Isocyanates from Amines Using Triphosgene
摘要:
Comparison of base-promoted and self-catalyzed conditions for the synthesis of isocyanates from amines and triphosgene shows no advantage in using an amine base in the majority of cases. The workup and isolation of the product is simplified under base-free conditions. Yields of between 50 and 90% after distillation were common. Only acid-sensitive substrates need a base catalyst.
Wide rim tetraurea calix[4]arenes monofunctionalized at the narrow rim by COOH or NH2 have been synthesized in five steps from t-butylcalix[4]arene tripropylether. Their covalent linkage via the narrow rim to a central calix[4]arene fixed in the 1,3-alternate conformation led to pentacalix[4]arenes 9 bearing four tetraurea derivatives in the cone conformation in a flexible tetrahedral arrangement.
由叔丁基杯[4]芳烃三丙醚经五步合成了在CO 2或NH 2的作用下在窄边单官能化的宽边四脲杯[4]芳烃。它们通过狭窄的边缘与固定在1,3-交替构象中的中心杯[4]芳烃的共价键合导致五元螺旋[4]芳烃9带有呈柔性四面体排列的圆锥构象中的四个四脲衍生物。在不同条件下研究了它们通过形成氢键合二聚体胶囊的自组装。1 H NMR光谱和动态光散射证实了类型9的四-四脲衍生物与四甲苯脲10的四重异二聚。
CIZMARIK, J.;BOROVANSKY, A.;TUMOVA, I., PHARMAZIE, 42,(1987) N 10, 702-703
作者:CIZMARIK, J.、BOROVANSKY, A.、TUMOVA, I.
DOI:——
日期:——
Oxime Carbamate—Discovery of a series of novel FAAH inhibitors
作者:S.Y. Sit、Charles M. Conway、Kai Xie、Robert Bertekap、Clotilde Bourin、Kevin D. Burris
DOI:10.1016/j.bmcl.2009.11.080
日期:2010.2
A series of noveloximecarbamates have been identified as potent inhibitors of the key regulatory enzyme of the endocannabinoid signaling system, fatty acid amide hydrolase (FAAH). In this Letter, the rationale behind the discovery and the biological evaluations of this novel class of FAAH inhibitors are presented. Both in vitro and in vivo results of selected targets are discussed, along with inhibition
Comparison of Base‐Promoted and Self‐Catalyzed Conditions in the Synthesis of Isocyanates from Amines Using Triphosgene
作者:Yiannis C. Charalambides、Stephen C. Moratti
DOI:10.1080/00397910601055156
日期:2007.3.1
Comparison of base-promoted and self-catalyzed conditions for the synthesis of isocyanates from amines and triphosgene shows no advantage in using an amine base in the majority of cases. The workup and isolation of the product is simplified under base-free conditions. Yields of between 50 and 90% after distillation were common. Only acid-sensitive substrates need a base catalyst.