Three-component reactions of CF3-substituted boranes, ethyl diazoacetate and imines
摘要:
Aryl(methoxy)(trifluoromethyl)boranes, generated in situ, readily react with ethyl diazoacetate and N-(4-methoxyphenyl)imines to give derivatives of beta-amino acids. In this process, the electron-deficient borane reacts with the diazo compound followed by trapping of the intermediate boron enolate by the imine. The final products are predominantly produced as syn isomers. (C) 2012 Elsevier Ltd. All rights reserved.
Three-component reactions of CF3-substituted boranes, ethyl diazoacetate and imines
作者:Pavel K. Elkin、Vitalij V. Levin、Alexander D. Dilman、Marina I. Struchkova、Dmitry E. Arkhipov、Alexander A. Korlyukov
DOI:10.1016/j.tetlet.2012.08.153
日期:2012.11
Aryl(methoxy)(trifluoromethyl)boranes, generated in situ, readily react with ethyl diazoacetate and N-(4-methoxyphenyl)imines to give derivatives of beta-amino acids. In this process, the electron-deficient borane reacts with the diazo compound followed by trapping of the intermediate boron enolate by the imine. The final products are predominantly produced as syn isomers. (C) 2012 Elsevier Ltd. All rights reserved.
Borylation using group IV metallocene under mild conditions
作者:Ludovic D. Marciasini、Michel Vaultier、Mathieu Pucheault
DOI:10.1016/j.tetlet.2014.01.080
日期:2014.3
A borylation reaction of aromatic diazonium salts has been optimized using titanocene and zirconocenederivatives as catalysts. The reaction employs diisopropylaminoborane as a borylating agent and proceeds smoothly at room temperature to provide arylboronates after methanolysis and transesterification with pinacol. The reaction mechanism has been found to proceed via a radical pathway.