Synthesis of 5-Phosphonyl-2(1H)-pyridones from Primary b-Enaminophosphonate and Acetylenic Esters
摘要:
Primary beta-enaminophosphonates (2) are obtained from metallated diethyl methylphosphonate and nitriles. Reaction of enamines (2) with ethyl propiolate and dimethyl acetylenedicarboxylate yields 1:1 adducts (7) and (8), respectively. Treatment of monoadducts (7) with sodium hydride leads to 5-phosphonyl-2(1H)-pyridones (1). Functionalized enamines (8) under go thermal cyclocondensation 1 to give pyridones (9).
Synthesis of 5-Phosphonyl-2(1H)-pyridones from Primary b-Enaminophosphonate and Acetylenic Esters
摘要:
Primary beta-enaminophosphonates (2) are obtained from metallated diethyl methylphosphonate and nitriles. Reaction of enamines (2) with ethyl propiolate and dimethyl acetylenedicarboxylate yields 1:1 adducts (7) and (8), respectively. Treatment of monoadducts (7) with sodium hydride leads to 5-phosphonyl-2(1H)-pyridones (1). Functionalized enamines (8) under go thermal cyclocondensation 1 to give pyridones (9).
A simple and efficient strategy for the preparation of 5-phosphorylated imidazol-2-ones from primary β-enaminophosphonates
作者:Francisco Palacios、Ana MaOchoa de Retana、Julen Oyarzabal、J.M. Ezpeleta
DOI:10.1016/s0040-4020(97)10438-0
日期:1998.3
An easy and efficient synthesis of imidazol-2-ones 5 substituted with a phosphonate group in the 5-position is described. The key step is a heterocyclization of functionalized enamines 3. These compounds 3 are formed by addition of primary β-enaminophosphonates 1 to diethyl azodicarboxylate 2.
A new and efficient strategy for the preparation of 1,5,2-diazaphosphorines from primary β-enaminophosphonates
作者:Francisco Palacios、Ana M. Ochoa de Retana、Julen Oyarzabal
DOI:10.1016/s0040-4020(99)00068-x
日期:1999.3
A new and efficient synthesis of 1,5,2-diazaphosphorines is described. The key step is a base-induced heterocyclization of functionalized urea compounds. These compounds are formed by addition of primary beta-enaminophosphonates to isocyanates. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of 5-Phosphonyl-2(1H)-pyridones from Primary b-Enaminophosphonate and Acetylenic Esters
作者:Francisco Palacios、Jesús García、Ana Ma Ochoa de Retana、Julen Oyarzabal
DOI:10.3987/com-95-7147
日期:——
Primary beta-enaminophosphonates (2) are obtained from metallated diethyl methylphosphonate and nitriles. Reaction of enamines (2) with ethyl propiolate and dimethyl acetylenedicarboxylate yields 1:1 adducts (7) and (8), respectively. Treatment of monoadducts (7) with sodium hydride leads to 5-phosphonyl-2(1H)-pyridones (1). Functionalized enamines (8) under go thermal cyclocondensation 1 to give pyridones (9).