Preparation of Diphenylphosphinoserine and Synthesis of Other Phosphine Containing Amino Acids Using Zinc/Copper Reagents
作者:Scott J. Greenfield、Scott R. Gilbertson
DOI:10.1055/s-2001-18431
日期:——
Primary and secondary iodo amino acids are converted to zinc iodides. The resulting organozinc iodides are reacted with copper, and then coupled with aryl and alkyl phosphine chlorides in good to moderate yields.
Enantioselective [3 + 2]-Cycloadditions Catalyzed by a Protected, Multifunctional Phosphine-Containing α-Amino Acid
作者:Bryan J. Cowen、Scott J. Miller
DOI:10.1021/ja0734243
日期:2007.9.1
Catalytic asymmetric [3 + 2]-cycloadditionreactions between α-allenic esters and enones are presented. We have found that a simple phosphine-containing protected α-amino acid derivative is capable of promoting such cycloadditions in high yields with significant levels of regioselectivity and enantioselectivity. Furthermore, employing chiral racemic γ-substituted allenoates in the cycloaddition with
介绍了 α-丙二烯酯和烯酮之间的催化不对称 [3 + 2]-环加成反应。我们发现,一种简单的含膦受保护的 α-氨基酸衍生物能够以高产率促进此类环加成反应,并具有显着的区域选择性和对映选择性。此外,在与查耳酮底物的环加成反应中使用手性外消旋 γ-取代的烯丙酸酯会导致“去外消旋”反应,以高产率提供高达 93% ee 的环戊烯。
High Asymmetric Induction with β-Turn-Derived Palladium Phosphine Complexes
作者:Scott J. Greenfield、Anton Agarkov、Scott R. Gilbertson
DOI:10.1021/ol035097j
日期:2003.8.1
[reaction: see text] Work toward the development of a bisphosphine ligand system for the palladium-catalyzed addition to cyclic allyl acetates is reported. A parallel approach using phosphine-containing amino acids in conjunction with natural amino acids was used to develop a selective ligand system. The ligand system was examined while attached to the polymer support as well as in solution. Selectivites