First Synthesis of a Highly Basic Dendrimer and its Catalytic Application in Organic Methodology
作者:Arunkanti Sarkar、Palanichamy Ilankumaran、Philip Kisanga、John G. Verkade
DOI:10.1002/adsc.200404089
日期:2004.8
Sixteen OCH2CH2N3P(i-BuNCH2CH2)3N substituents (A) containing the highly basic bicyclic azido-phosphine moiety shown, have been incorporated into the dendrimer [CH2CH2N[(CH2)3N[(CH2)3NHC(O)-3,5-bis-(A)-C6H3]2]2]2 in five steps from commercially available starting materials with an overall yield of 22.5%. Also presented are examples of Michael additions, nitroaldol reactions and aryl isocyanate trimerizations
已将包含所示的高度碱性双环叠氮基膦部分的16个OCH 2 CH 2 N 3 P(i -BuNCH 2 CH 2)3 N取代基(A)引入树枝状聚合物[CH 2 CH 2 N [(CH 2)3 N [(CH 2)3 NHC(O)-3,5-双-(A)-C 6 H 3 ] 2 ] 2 ] 2从市售原料中分五个步骤完成,总收率为22.5%。还提供了由树状大分子有效催化的迈克尔加成反应,硝基缩醛反应和芳基异氰酸酯三聚反应的例子。
Palladium-assisted carboacylation of olefins
作者:Louis S. Hegedus、W. H. Darlington
DOI:10.1021/ja00535a027
日期:1980.7
Phosphine-boronates: efficient bifunctional organocatalysts for Michael addition
Phosphine-boronates R(2)P(o-C(6)H(4))B(OR')(2) have been evaluated as bifunctionalorganocatalysts for the Michaeladdition of malonate pronucleophiles to methylvinylketone. The presence of the Lewis acidic boron center adjacent to phosphorus significantly improves catalytic performance. Isolation and complete characterization of a key intermediate, namely a beta-phosphonium enolate, substantiate the