Phosphoramidate Tantalum Complexes for Room-Temperature CH Functionalization: Hydroaminoalkylation Catalysis
作者:Pierre Garcia、Ying Yin Lau、Mitchell R. Perry、Laurel L. Schafer
DOI:10.1002/anie.201304153
日期:2013.8.26
A cooled reaction: Phosphoramidate–ClTaMe3 complexes promote the first example of room‐temperature hydroaminoalkylation catalysis. This reaction can be realized under solvent‐free conditions and with challenging substrates such as styrenes and dialkyl amines. When using a vinylsilane substrate, for the first time the linear regioisomer is obtained preferentially using a Group 5 metal. TBS=tert‐butyldimethylsilyl
study on the iodine-mediated phosphoramidation reaction of amines and trialkyl phosphites was conducted, which not only disclosed the factors affecting the reaction but also revealed that it could proceed smoothly in CH2Cl2 at room temperature in open air. Using this method, various phosphoramidates with different aliphatic amines and aromatic amines were synthesized in good to excellent yields. Our
On the rearrangement of N-aryl-N-Boc-phosphoramidates to N-Boc-protected o-aminoarylphosphonates
作者:Edyta Kuliszewska、Friedrich Hammerschmidt
DOI:10.1007/s00706-017-2058-x
日期:2018.1
phosphorus atom with its substituents from the nitrogen to the ortho-carbanionic carbon atom gave N-Boc-protected o-aminoarylphosphonates. The nature of the substituent of 3-substituted phenylphosphoramidates strongly influenced the regioselectivity of phosphonate formation. A crossover experiment with a deuterated phosphoramidate proved the intramolecular course of the rearrangement. Three representative
Kinetics and Mechanism of the Anilinolysis of Diisopropyl Chlorophosphate in Acetonitrile
作者:Md. Ehtesham Ul Hoque、Hai-Whang Lee
DOI:10.5012/bkcs.2011.32.9.3245
日期:2011.9.20
anilines () and deuterated anilines () are investigated kinetically in acetonitrile at . The anilinolysis rate of 3 is rather slow to be rationalized by the conventional stereoelectronic effects. The obtained deuterium kinetic isotope effects (DKIEs; ) are secondary inverse ( = 0.71-0.95) with maximum magnitude at X = H.A concerted mechanism involving predominant backside nucleophilic attack is proposed on
氯磷酸二异丙酯 (3) 与取代苯胺 () 和氘代苯胺 () 的亲核取代反应在乙腈中进行了动力学研究。3 的苯胺分解速率相当慢,无法通过传统的立体电子效应合理化。所获得的氘动力学同位素效应 (DKIEs;) 是二次反演 (= 0.71-0.95),在 X = HA 处具有最大值,在二次反演 DKIE 的基础上提出了涉及主要背面亲核攻击的协同机制。
Kinetics and Mechanism of Anilinolysis of Phenyl N-Phenyl Phosphoramidochloridate in Acetonitrile
作者:Md. Ehtesham Ul Hoque、Hai-Whang Lee
DOI:10.5012/bkcs.2012.33.10.3274
日期:2012.10.20
reactions of phenyl N-phenyl phosphoramidochloridate (8) with substituted anilines () and deuterated anilines () have been carried out in acetonitrile at . The obtained deuterium kinetic isotope effects (DKIEs; ) are huge secondary inverse ( = 0.52-0.69). A concerted mechanism is proposed with a backside attack transition state (TS) on the basis of the secondary inverse DKIEs and the variation trends of the