intermediates, such as enynes and silylbenzofulvenes, have been isolated. Different control experiments have been performed, indicating the participation of [LAu][NTf2AlCl3] complex as the true catalyst, and revealing a dramatic enhancement of the gold activity by coordination of the Lewis acid to the gold counterion.
A simple and efficient method for the transprotection of aryl methyl ether to easily cleavable arylbenzoate mediated by microwave activation has been developed. One important feature of this method is its high tolerance towards sensitive functionalities and to some extent to bulky environment. (c) 2006 Elsevier Ltd. All rights reserved.
Staedel, Justus Liebigs Annalen der Chemie, 1883, vol. 218, p. 340
作者:Staedel
DOI:——
日期:——
Divergent Approach for Synthesis and Terminal Modifications of Dendritic Polyphenylazomethines
作者:Kensaku Takanashi、Kimihisa Yamamoto
DOI:10.1021/ol701925a
日期:2007.12.1
In the past, dendritic polyphenylazomethines (DPA) have been synthesized via the convergent method. However, the convergent method has problems such as difficult terminal-group modifications and an increased number of steps. Therefore, we synthesized the terminal-protected DPA to construct the dendritic structure via the divergent method. The combination of the convergent method and the divergent method easily achieved the rapid synthesis of a higher generation dendrimer. Furthermore, we succeeded in the synthesis of the water-soluble PEG-DPA via the divergent method using the ester-DPA.