[EN] PHOSPHORUS LIGANDS AND METHODS OF USE<br/>[FR] LIGANDS PHOSPHORÉS ET PROCÉDÉS D'UTILISATION
申请人:UNIV CALIFORNIA
公开号:WO2016094489A1
公开(公告)日:2016-06-16
In one embodiment, the application discloses ligands, such as a ligand from a dihydrobenzo [1,3] oxaphosphole scaffold, and palladium or other transition metal complexes comprising the ligands and methods for performing cross coupling reactions and asymmetric cross coupling reactions with high selectivity and efficiency, under aqueous micellar catalysis conditions.
Here we report the total synthesis of phainanoid A, a unique dammarane-type triterpenoid (DTT), using an unusual bidirectional synthetic strategy. It features two transition-metal-mediated highly diastereoselective transformations to access the two challenging strained ring systems that branch toward opposite directions from the tricyclic core. This work also highlights the strategic use of ketones
在这里,我们报告了 phainanoid A 的全合成,这是一种独特的达玛烷型三萜 (DTT),使用不寻常的双向合成策略。它具有两个过渡金属介导的高度非对映选择性转化,以访问从三环核心向相反方向分支的两个具有挑战性的应变环系统。这项工作还强调了酮(或烯醇三氟甲磺酸酯)作为通用手柄的战略用途,可在所有关键转化中快速增加分子复杂性,这为有效制备复杂且具有生物学意义的 DTT 铺平了道路。
Rational Ligand Design for the Arylation of Hindered Primary Amines Guided by Reaction Progress Kinetic Analysis
作者:Paula Ruiz-Castillo、Donna G. Blackmond、Stephen L. Buchwald
DOI:10.1021/ja512903g
日期:2015.3.4
We report the Pd-catalyzed arylation of very hindered α,α,α-trisubstituted primary amines. Kinetics-based mechanistic analysis and rational design have led to the development of two biarylphosphine ligands that allow the transformation to proceed with excellent efficiency. The process was effective in coupling a wide range of functionalized aryl and heteroaryl halides under mild conditions.
JoyaPhos: An Atropisomeric Teraryl Monophosphine Ligand
作者:Alessandro Castrogiovanni、Dominik Lotter、Fabian R. Bissegger、Christof Sparr
DOI:10.1002/chem.202001269
日期:2020.8.6
gold(I)‐catalyzed [2+2] cycloaddition and cycloisomerization reactions as well as a unique intramolecular Pd‐catalyzed C−N cross‐coupling for the atroposelective synthesis of a N‐aryl‐indoline bearing a C−N stereogenic axis. The ligand structure induced up to 95:5 stereoselectivity in the asymmetricallylicalkylation reaction and features an interesting dynamic behavior as observed by X‐ray crystallographic
Late-Stage Functionalization of the Periphery of Oligophenylene Dendrimers with Various Arene Units via Fourfold C–H Borylation
作者:Ryosuke Masuda、Satoru Kuwano、Kei Goto
DOI:10.1021/acs.joc.1c01252
日期:2021.11.5
periphery of oligophenylene dendrimers was efficiently achieved via site-selective C–H activation of a preconstructed, readily accessible dendron. By fourfold iridium-catalyzed C–H borylation followed by Suzuki–Miyaura cross-coupling, various arene units were introduced into the end points of the 1,3,5-phenylene-based hydrocarbon dendron. Coupling of the modified dendrons with a core unit, such as 2,6-dibromobenzoic