Enantioselective Desymmetrization of Diphenylphosphinamides via (−)-Sparteine-Mediated <i>Ortho</i>-Lithiation. Synthesis of <i>P</i>-Chiral Ligands
作者:Cristinel Popovici、Pascual Oña-Burgos、Ignacio Fernández、Laura Roces、Santiago García-Granda、María José Iglesias、Fernando López Ortiz
DOI:10.1021/ol902545q
日期:2010.2.5
N-dialkyl-P,P-diphenylphosphinamides using [n-BuLi·(−)-sparteine] is described as an efficient method for the synthesis of P-chiral ortho-functionalized derivatives in high yields and ee’s from 45 to >99%. The method allows access to new enantiomerically pure P-chiralphosphine and diimine ligands.
描述使用[ n -BuLi·(-)-sparteine]对N-二烷基-P,P-二苯基次膦酰胺进行不对称邻位锂化是一种高效合成P-手性邻位官能化衍生物的有效方法,ee产自45到> 99%。该方法允许获得新的对映体纯的P-手性膦和二亚胺配体。
Cobalt-Catalyzed Diastereoselective [4+2] Annulation of Phosphinamides with Heterobicyclic Alkenes at Room Temperature
作者:Rajender Nallagonda、Neetipalli Thrimurtulu、Chandra M. R. Volla
DOI:10.1002/adsc.201701162
日期:2018.1.17
Cobalt‐catalyzed sp2 C−H bond functionalization of diarylphosphinamides with heterobicyclic alkenes was demonstrated at roomtemperature employing commercially available cobalt(II)‐salts. The effectiveness of this strategy was illustrated with the reaction of various 8‐aminoquinoline derived phosphinic amides and 7‐oxa/azabenzonorbornadienes. The reaction conditions exhibited excellent functional group tolerance
Pd(II)-Catalyzed Enantioselective Synthesis of P-Stereogenic Phosphinamides via Desymmetric C–H Arylation
作者:Zhi-Jun Du、Jing Guan、Guo-Jie Wu、Peng Xu、Lian-Xun Gao、Fu-She Han
DOI:10.1021/ja512029x
日期:2015.1.21
We present the enantioselectivesynthesis of P-stereogenic phosphinamides through Pd-catalyzed desymmetric ortho C-H arylation of diarylphosphinamides with boronic esters. The method represents the first example of the synthesis of P-stereogenic phosphorus compounds via the desymmetric C-H functionalization strategy. The reaction proceeded efficiently with a wide array of reaction partners to afford
我们提出了通过 Pd 催化的二芳基膦酰胺与硼酸酯的去对称邻 CH 芳基化对 P-立体异构膦酰胺的对映选择性合成。该方法代表了通过去对称 CH 功能化策略合成 P-立体磷化合物的第一个例子。该反应与各种反应伙伴一起有效进行,以高达 74% 的产率和 98% 的 ee 提供 P-立体膦酰胺。通过克规模合成进一步证明了效率。此外,还详细阐述了 P-立体磷酰胺向各种类型的 P-立体磷衍生物的灵活转化。因此,该协议为 P 立体化合物的高效和通用合成提供了一种新工具。
Synthesis of P-stereogenic cyclicphosphinic amide via electrochemical enabled cobalt-catalyzed enantioselective C–H annulation
and proceeded efficiently in a shorterreaction time compared with the previous work using oxidants. The process employs a combination of readily available chiral salicyloxazoline and cobalt acetate tetrahydrate as an inexpensive catalyst. Notably, the kinetic resolution process was also achieved with s factors up to 347.8. Experimental, kinetic and computationalstudies on cobalta-electrocatalysis provide