66197-72-6Relevant articles and documents
Enantioselective organocatalytic conjugate addition of aldehydes to vinyl sulfones and vinyl phosphonates as challenging michael acceptors
Sulzer-Mosse, Sarah,Alexakis, Alexandre,Mareda, Jiri,Bollot, Guillaume,Bernardinelli, Gerald,Filinchuk, Yaroslav
supporting information; experimental part, p. 3204 - 3220 (2009/12/03)
Chiral amines with a pyrrolidine framework catalyze the enantioselective conjugate addition of a broad range of aldehydes to various vinyl sulfones and vinyl phosphonates in high yields and with enantioselectivities up to >99% ee. This novel process provides synthetically useful chiral γ-gem-sulfonyl or phosphonyl aldehydes which can be widely functionalized with retention of the enantiomeric excess. Mechanistic insights including DFT calculations are explored in detail.
Improved preparation of diethyl bromomethylphosphonate and diiodomethane-catalyzed triethylphosphite Michaelis-Arbuzov isomerization
Ezquerra,Yruretagoyena,Moreno-Manas,Roglans
, p. 191 - 194 (2007/10/02)
An improved method to prepare diethyl bromomethylphosphonate and a new method for the isomerization of triethyl phosphite into diethyl ethylphosphonate are reported.
Free radical reaction of α-haloalkylphosphonates with alkenes and alkynes: A new approach to modified phosphonates
Balczewski,Mikolajczyk
, p. 392 - 396 (2007/10/02)
A new approach to the synthesis of phosphonates 3 functionalized in the α- and γ-phosphonate positions by alkyl, ethoxy, butoxy, acetoxy, acetyl and cyanide groups and allylphosphonate 6 is described. It is based on the radical reaction of α-halosubstituted phosphonates 1 (X = Cl, Br, I) with the terminally unsubstituted alkenes 2 (1-heptene, ethoxyethene, butoxyethene, acetoxyethene, acrylonitrile, methyl vinyl ketone) and alkyne 5 (hept-1-yne). The reaction involving the tin hydride method (Bu3SnH/AIBN) was more effective with alkenes than with alkynes (40-72% versus 20-30%). With electron-rich alkenes, chloro- and bromomethylphosphonates 1 (X = Cl, Br) gave higher yields than iodomethylphosphonate 1 (X = I). Diethyl methylphosphonate 4, as a reduction product of 1, accompanied 3 and 6 in the above reactions. The yield of 4 could be reduced by optimizing the reaction conditions.
α-Substituted Phosphonates. 39. Methane-diphosphonic Esters by U.V.-Induced Michaelis-Becker-Reaction
Czekanski, T.,Gross, H.,Costisella, B.
, p. 537 - 544 (2007/10/02)
Dibromomethane resp. chlorbromomethane reacts with sodium dialkyl phosphite in heptane-/liq.NH3 or in liq.NH3 by u.v. irradiation at low temperatures to give in good yields methane diphosphonic acid tetraalkylesters 1.In the same manner with sodium diethyl thionophosphite the corresponding methane-bisthiophosphonic acid tetraethylester 4 is obtained.