A Convenient (E)-Stereoselective Synthesis of Alkenylphosphonates
摘要:
Diethyl (E)-alkenylphosphonates have been prepared stereoselectively by dehydration of the corresponding beta-hydroxyphosphonates using DCC/CuCl2 in refluxing toluene. Starting beta-hydroxyphosphonates were obtained in high yield from diethyl methylphosphonate.
A Convenient (E)-Stereoselective Synthesis of Alkenylphosphonates
摘要:
Diethyl (E)-alkenylphosphonates have been prepared stereoselectively by dehydration of the corresponding beta-hydroxyphosphonates using DCC/CuCl2 in refluxing toluene. Starting beta-hydroxyphosphonates were obtained in high yield from diethyl methylphosphonate.
A new entry to β-hydroxyphosphonates: the SmI2-mediated reaction of diethyl iodomethylphosphonate with carbonyl compounds
作者:Fulvia Orsini、Alessandro Caselli
DOI:10.1016/s0040-4039(02)01539-3
日期:2002.9
In the presence of samarium iodide α-halophosphonates react with aliphatic carbonylcompounds (aldehydes and ketones) to afford β-hydroxyphosphonates in fairly good yields under neutral and mild conditions. Lower yields are obtained with aromatic carbonylcompounds.
Phosphorohydrazidates have been shown to work as radical precursors by iron-catalyzed aerobic oxidation to generate corresponding phosphonyl radicals. Generated radicals cause intermolecular addition to various alkenes in the presence of molecular oxygen to give beta-hydroxyphosphonate compounds in good yield. (C) 2011 Elsevier Ltd. All rights reserved.