A simple synthesis of 3-phosphonyl-4-aminoquinolines from β-enaminophosphonates
作者:Francisco Palacios、Ana M. Ochoa de Retana、Julen Oyarzabal
DOI:10.1016/s0040-4020(99)00257-4
日期:1999.4
An easy and efficient synthesis of 4-aminoquinolines substituted with a phosphorylated group or a phosphine oxide group in the 3-position is described. The key step is a regioselective addition of lithiated beta-enamino phosphonates to isocyanates to give functionalized amides. Subsequent cyclization of these compounds with triphenylphosphine and hexachloroethane in the presence of triethylamine afforded substituted 4-aminoquinolines. The deprotection of N-PMP substituted 4-amino-quinolines with CAN in acetonitrile gave primary 4-aminoquinolines. (C) 1999 Elsevier Science Ltd. All rights reserved.
α,α-Difluoro-β-iminophosphonates, an alternative strategy towards the synthesis of α,α-difluoro-β-aminophosphonate derivatives
作者:M. Z. Szewczyk、M. Rapp、D. Virieux、J.-L. Pirat、H. Koroniak
DOI:10.1039/c7nj00997f
日期:——
enzyme inhibitors. Herein, we report an alternative strategy towards the synthesis of α,α-difluoromethylene-β-aminophosphonate derivatives. A small library of N-substituted α,α-difluoro-β-aminophosphonates was designed and described via NMR study. The protocol began with the condensation of β-ketophosphonates with a series of primary amines. The key step of the synthesis is an electrophilic fluorination