N-Thiophosphorylated andN-Phosphorylated Iminophosphoranes [R3P=N–P(X)R′2; × = O, S] as Models for Dendrimers: Synthesis, Reactivity and Crystal Structures
Regioselective functionalisation of nitrobenzene and benzonitrile derivatives via nucleophilic aromatic substitution of hydrogen by phosphorus-stabilized carbanions
作者:Carmen M. Andújar Sánchez、Ma José Iglesias、Jesús García Lopez、Isidro J. Pérez Álvarez、Fernando López Ortiz
DOI:10.1016/j.tet.2006.01.088
日期:2006.4
oxide groups by displacement of hydrogen of a variety of electron-deficient benzene derivatives is described. Lithium phosphazenes were the most suitable nucleophiles for the substitution of hydrogen in nitrobenzene and some ortho-, meta-, and para- substitutednitrobenzenes. Lithiated phosphine borane complexes produced efficiently the substitution of the hydrogen at the para position of a cyano group
Synthesis of 1,2-dihydro-1,3-diaza-2λ5,4λ5-2,4-diphosphorine 2-oxides
作者:Carmen M Andújar、Isidro Pérez Álvarez、Fernando López Ortiz
DOI:10.1016/s0040-4020(02)00144-8
日期:2002.3
The reaction of lithium (N-diphenylphosphoryl)phosphazenes with nitriles afforded 1,2-dihydro-1,3-diaza-2lambda(5),4lambda(5)-2,4-diphosphorine 2-oxides through a C-regioselective addition to the cyano linkage followed by in situ cyclocondensation. The new heterocycles 4:1 were designed to mimic thymine and are promising chemotherapeutic anticancer agents. As an exception, for p-nitrobenzonitrile a SNAr C, reaction was exclusively observed with the nucleophile entering in the ortho position of the nitro substituent in a process directed by the strong electron withdrawing effect of the NO2 group. (C) 2002 Elsevier Science Ltd. All rights reserved.