Poly(propyleneimine) (PPI) dendrimers functionalized with C16 alkyl chains acted as efficient tertiary amine catalysts for an intramolecular Michael reaction. The substrate was accommodated in a reactive conformation within a sterically confined nanocavity consisting of regularly arranged tertiary amino groups of the PPI dendrimers.
用 C16 烷基链功能化的聚(丙烯酰亚胺)(PPI)树枝状聚合物是分子内迈克尔反应的高效叔胺催化剂。底物在由 PPI 树枝形分子中规则排列的叔氨基组成的立体封闭纳米空腔中呈反应构象。
An Efficient Synthesis of Nitroalkenes by Alkene Cross Metathesis: Facile Access to Small Ring Systems
作者:Graham P. Marsh、Philip J. Parsons、Clive McCarthy、Xavier G. Corniquet
DOI:10.1021/ol070557k
日期:2007.7.1
A synthesis of highly functionalized nitroalkenes is reported that utilizes a cross metathesis (CM) reaction between simple aliphatic nitrocompounds and a range of substituted alkenes. This chemistry offers a simple and attractive route to nitroalkenes that would otherwise be difficult to prepare, and that have a very useful application as precursors to a variety of heterocyclic entities.