Direct CHamidation of arylphosphoryl compounds has been developed by using an IrIII catalyst system under mild conditions. A wide range of substrates could be employed with high functional‐group tolerance. This procedure was successfully applied for the first time to the asymmetric reaction giving rise to a P‐chirogenic center with a high diastereomeric ratio of up to 19:1 (90 % de).
Cooperative Effects between Chiral Cp<sup>x</sup>-Iridium(III) Catalysts and Chiral Carboxylic Acids in Enantioselective C−H Amidations of Phosphine Oxides
作者:Yun-Suk Jang、Michael Dieckmann、Nicolai Cramer
DOI:10.1002/anie.201708440
日期:2017.11.20
Catalytic handshake: A cooperative effect between a chiral CpxIrIII complex and chiral carboxylic acid enables highly enantioselective C−H amidations of phosphine oxides with up to 99:1 er. Matched–mismatched pairs have a strong influence on the reactivity and selectivity.
催化握手:手性Cp x Ir III配合物与手性羧酸之间的协同作用可使膦氧化物的高对映选择性CH酰胺化反应的时间高达99:1 er。配对不匹配对对反应性和选择性有很大影响。
[2,3]-Sigmatropic Rearrangements of 2-Phosphineborane 2-Propen-1-ols: Rapid Access to Enantioenriched Diphosphine Monoxide Derivatives
作者:Carl A. Busacca、Bo Qu、Elisa Farber、Nizar Haddad、Nicole Grět、Anjan K. Saha、Magnus C. Eriksson、Jiang-Ping Wu、Keith R. Fandrick、Steve Han、Nelu Grinberg、Shengli Ma、Heewon Lee、Zhibin Li、Michael Spinelli、Austin Gold、Zhuzhu Wang、Guijun Wang、Peter Wipf、Chris H. Senanayake
DOI:10.1021/ol400310h
日期:2013.3.1
secondary propargylic alcohols generates phosphine-containing allylic alcohols that undergo facile [2,3]-sigmatropic rearrangements with chlorophosphines, furnishing highly enantioenriched, crystalline diphosphine monoxides. The configuration at the newly formed stereocenter is opposite to that expected based on prior studies, and an ab initio computational evaluation of the possible transition states was
I
<sub>2</sub>
/TBHP Mediated Divergent C(sp
<sup>2</sup>
)‐P Cleavage of Allenylphosphine Oxides: Substituent‐Controlled Regioselectivity
作者:Teng Liu、Jie Zhu、Xue Sun、Liang Cheng、Lei Wu
DOI:10.1002/adsc.201900334
日期:2019.8.5
regioselective C(sp2)‐P(O) cleavage of allenylphosphine oxides mediated by I2/TBHP is achieved for the first time. The divergent pathway via cleavage of (Ph)C−P(O) or (allene)C−P(O) modulated by substituents, renders the formation of 4‐iodo‐2‐phenyl‐5H‐1,2‐oxa‐phosphole 2‐oxide and α‐iodoenone derivatives, respectively. A plausible mechanism through radical pathways, along with the cleavage of phenyl and diphenylphosphine
首次实现了由I 2 / TBHP介导的烯丙基膦氧化物的高区域选择性C(sp 2)-P(O)裂解。通过取代基调节的(Ph)C-P(O)或(丙二烯)C-P(O)裂解的发散途径导致形成4-碘-2--2-苯基-5 H -1,2-氧杂-分别是2-氧化物和α-碘烯酮衍生物。捕获实验和18个O同位素标记研究证实了通过自由基途径以及裂解苯基和二苯基膦氧化物部分的合理机制。
Palladium-Catalyzed Cascade C−O Cleavage and C−H Alkenylation of Phosphinyl Allenes: An Expeditious Approach to 3-Alkenyl Benzo[<i>b</i>
]phosphole Oxides
作者:Teng Liu、Xue Sun、Lei Wu
DOI:10.1002/adsc.201800103
日期:2018.5.16
time. The palladium‐catalyzed intramolecular cyclization provides an unprecedented cascade C−O cleavage and direct C−H alkenylation toward novel 3‐alkenyl benzo[b]phosphole oxides, along with broad group tolerance and high regioselectivity. Control experiments and mechanisticstudies explain the sequential performance of C(sp3)‐OAr cleavage and P=O directed C(sp2)‐Hactivation.
首次建立了由氧化膦定向的次膦基烯丙二烯分子内环化反应。钯催化的分子内环化作用提供了前所未有的级联C-O裂解和将CH-H烯基化成新型3-烯基苯并[ b ]磷氧化物的方法,并具有宽基团耐受性和高区域选择性。对照实验和机理研究解释了C(sp 3)-OAr裂解和P = O定向C(sp 2)-H活化的顺序性能。