Conjugated addition of bis(oxazolinyl)zinc to substituted 2-nitrovinyl benzenes: an alternative synthesis of (±)-Rolipram
作者:Alfredo R.M. Oliveira、José A.F.P. Villar、Fabio Simonelli、Rogério A. Gariani、Celso L. Wosch、Paulo H.G. Zarbin
DOI:10.1016/j.tetlet.2006.12.007
日期:2007.2
In this letter we present a new 2,4,4-trimethyl-2-oxazoline anion-zinc derivative that has a remarkable thermal stability when compared with the corresponding cyanocuprate counterpart. The yields from conjugated addition to several 2-nitrovinyl benzenes are moderate to good and the reaction itself is easier to execute and cleaner. As an application, this methodology was applied to an alternative synthesis of (+/-)-Rolipram, a drug with several interesting biological activities. (c) 2006 Elsevier Ltd. All rights reserved.