Asymmetric Synthesis of 2H-Azirines Derived from Phosphine Oxides Using Solid-Supported Amines. Ring Opening of Azirines with Carboxylic Acids
摘要:
A simple and efficient asymmetric synthesis of 2H-azirine-2-phosphine oxides 3 is described. The key step is a solid-phase bound achiral or chiral amine-mediated Neber reaction of beta-ketoxime tosylates derived from phosphine oxides 1. Reaction of 2H-azirines 3 and 11 with carboxylic acids 4 gives phosphorylated ketamides 5 and 12. Ring closure of ketamides 5 and 12 with triphenylphosphine and hexachloroethane in the presence of triethylamine leads to the formation of phosphorylated oxazoles 8 and 13.
描述了一种不对称合成2 H -azirine-2-膦酸酯6的简单有效的方法。关键步骤是衍生自膦酸酯的对甲苯磺酰氧肟4的碱介导的Neber反应。使用三乙胺5,生物碱7和固相键合的非手性8或手性胺9。在乙醇中用硼氢化钠还原2 H -azirines 6得到顺式-氮丙啶膦酸酯10。氮丙啶10和11的开环导致对映体富集的β-12和14以及α-氨基膦酸酯13和15。
Synthesis of optically active oxazoles from phosphorylated 2H-azirines and N-protected amino acids or peptides
作者:Francisco Palacios、Ana Marı́a Ochoa de Retana、José Ignacio Gil、José Marı́a Alonso
DOI:10.1016/s0957-4166(02)00686-9
日期:2002.11
triphenylphosphine and hexachloroethane in the presence of triethylamine leads to the formation of racemic and opticallyactive phosphorylated oxazoles containing N-protected amino acid residues 8 and 10. Deprotection of these oxazoles gives aminoalkyl oxazoles 11 and 12. 2H-Azirines 1 and 6 also react with N-protected peptides 13 and give functionalized ketamides 14 and 15, ring closure of which leads to the formation
Regioselective synthesis of 4- and 5-oxazole-phosphine oxides and -phosphonates from 2H-azirines and acyl chlorides
作者:Francisco Palacios、Ana M. Ochoa de Retana、José I. Gil、José M. Alonso
DOI:10.1016/j.tet.2004.07.013
日期:2004.9
A simple and efficient regioselective synthesis of 4-oxazole-phosphine oxides 11 and -phosphonates 12 from 2H-azirine-phosphine oxides 1 and -phosphonates 6 is described. The key step for the synthesis of oxazoles 11 is a base-mediated ring closure of vinylogous α-aminophosphorus compounds derived from phosphine oxides 4 and from phosphonates 8. These derivatives 4 and 8 are obtained by reaction of
Synthesis of Pyrazine-phosphonates and -Phosphine Oxides from 2<i>H</i>-Azirines or Oximes
作者:Francisco Palacios、Ana María Ochoa de Retana、José Ignacio Gil、Rafael López de Munain
DOI:10.1021/ol0261534
日期:2002.7.1
[reaction: see text] Tetrasubstituted pyrazines containing two phosphonate groups 2 in positions 2 and 5 and trisubstituted pyrazines containing a phosphonate 5 or a phosphine oxide group 7 in position 2 are obtained by thermal treatment of 2H-azirine-2-phosphonates 1 and -phosphine oxides 6. These pyrazines can also be prepared from beta-ketoxime tosylates 9 and 10 or from oxime derived from phosphine
Synthesis and biological evaluation of cyanoaziridine phosphine oxides and phosphonates with antiproliferative activity
作者:Victor Carramiñana、Ana M. Ochoa de Retana、Ander Vélez del Burgo、Jesús M. de los Santos、Francisco Palacios
DOI:10.1016/j.ejmech.2018.12.002
日期:2019.2
This work reports an efficient diastereoselective synthetic methodology for the preparation of phosphorus substituted cyanoaziridines through the nucleophilic addition of TMSCN, as cyanide source, to the C–N double bond of 2H-azirine derivatives. The aziridine ring, in these novel cyanoaziridines, can be activated by simple N-tosylation or N-acylation. In addition, the cytotoxic effect on cell lines
Easy and efficient synthesis of enantiomerically enriched 2H-azirines derived from phosphonates
作者:Francisco Palacios、Ana M Ochoa de Retana、José I Gil
DOI:10.1016/s0040-4039(00)00843-1
日期:2000.7
An efficient synthesis of 2H-azirines substituted with a phosphonate group is described. The key step is an alkaloid-mediated Neber reaction of beta-ketoxime tosylates. Reduction of 2H-azirines with sodium borohydride in ethanol gives 2-phosphorylated cis-aziridines. (C) 2000 Published by Elsevier Science Ltd.