1498-54-0Relevant academic research and scientific papers
Synthesis of N, N-dialkyl phosphoramidic dichloride from dialkyl amine and phosphoryl chloride using basic anion exchange polymer resins/beads
Kushwaha, Brijesh K.,Gupta, Hemendra K.,Shinde
, p. 361 - 364 (2009)
An efficient and operationally simple method is developed for the syndesis of N, N-dialkyl phosphoramidic dichloride from dialkyl amine and phosphoryl chloride using basic anion exchange polymer resins/beads. In me reaction, polymer resin acts as a scavenger for HCl produced as by-product and desired product is distilled under vacuum. Reaction afforded N, N-dialkyl phosphoramidic dichloride in 3-4 hours with excellent yields from corresponding dialkylamine and phosphoryl chloride.
A new mechanism for nucleophilic substitution at a thiophosphoryl centre revealed by the reaction of diisopropylamine with PSCl3
Harger, Martin J. P.
, p. 2863 - 2865 (2005)
The reaction of PSCl3 with Pri2NH at 60 °C affords the disubstitution product (Pri2N) 2P(S)Cl without first forming the monosubstitution product Pr i2NP(S)Cl2/su
Kinetic resolution of hydroperoxides with enantiopure phosphines: Preparation of enantioenriched tertiary hydroperoxides
Driver, Tom G.,Harris, Jason R.,Woerpel
, p. 3836 - 3837 (2008/02/13)
An efficient reductive kinetic resolution strategy capable of accessing optically active tertiary hydroperoxides is reported. Readily accessible tertiary hydroperoxides are resolved with commercially available (R)- or (S)-xylyl-PHANEPHOS with selectivity factors as large as 37. The resulting bis(phosphine oxide) can be recycled in high yields. The isolated mono(phosphine oxide) intermediate resolved hydroperoxides with the same selectivity as the parent bisphosphine. Copyright
Hydrolysis of cyclic phosphoramides. Evidence for syn lone pair catalysis
Nunez, Andres,Berroteran, Dyanna,Nunez, Oswaldo
, p. 2283 - 2289 (2007/10/03)
Hydrolysis between 1.5 31PNMR spectroscopy. The observed rates fit the equation: kobs = kH2O[H+]/([H+] + Ka) + k′su
Studies on chiral thiophosphoric acids and their derivatives 16. - The asymmetric cyclization of L-(+)-prolinol with (thio)phosphoro(-no)dichloridates
He, Zheng-Jie,Wang, You-Ming,Tang, Chu-Chi
, p. 59 - 66 (2007/10/03)
The cyclizations of L-(+)-prolinol 5 with (thio)phosphoro(-no)dichloridates 6 give 1,2,3-azaphosphaoxabicyclo[3.3.0]octanes 7 consisting of unequal amounts of diastereoisomers, eight pairs of which have been successfully resolved by silica gel column chromatography or recrystallization. The influences of reaction temperature, solvent and substrate concentration upon the asymmetric induction have also been investigated.
Synthesis, Activation, and Cytotoxicity of Aldophosphamide Analogues
Borch, Richard F.,Valente, Ronald R.
, p. 3052 - 3058 (2007/10/02)
A series of perhydrooxazine analogues of aldophosphamide has been prepared, and their 31P NMR kinetics and in vitro cytotoxicity have been evaluated.These compounds were developed on the basis of the idea that ring opening and tautomerization to an enamine intermediate might provide a mechanistic alternative to the β-elimination reaction for release of phosphoramide mustard.The 4,4,6-trimethyltetrahydro-1,3-oxazine moiety was selected on the basis of its rapid rate of iminium ion generation and relatively slow rate of hydrolysis.These analogues underwent phosphorodiamidate release by three distinct mechanisms: hydrolysis to aldophosphamide and subsequent β-elimination; cyclization to produce the 4-hydroxycyclophosphamides, which release phosphorodiamidate by ring opening and elimination; and tautomerization to the enamine with rapid expulsion of phosphorodiamidate.Kinetic studies demonstrated that hydrolysis to the aldehyde contributed minimally to the overall activation process and that the enamine pathway represented the major route of activation.For those analogues that could undergo cyclization this pathway competed effectively with enamine release, and these analogues were essentially equivalent to their 4-hydroxycyclophosphamide counterparts in cytotoxicity.A series of tetra-N-substituted phosphorodiamidates that cannot undergo cyclization was prepared to explore the effects of cyclization on the cytotoxicity of these analogues.The tetrakis(chloroethyl)phosphorodiamidates were highly potent in vitro against both cyclophosphamide-sensitive and -resistant L1210 and P388 cell lines, and one of these analogues had significant antitumor activity against L1210 leukemia in vivo.These results demonstrate that the enamine mechanism provides a viable pathway for delivery of phosphorodiamidates and that this approach can be used to deliver phosphorodiamidates that are non-cross-resistant in cyclophosphamide-resistant cell lines.
