Studies on the free radical carbon-carbon bond formation in the reaction of α-phosphoryl sulfides and selenides with alkenes
摘要:
alpha-Mono- and alpha, alpha-disubstituted alpha-phosphoryl radicals 9 were generated from the easy accessible alpha-phosphoryl sulfides 4, 5 and alpha-phosphoryl selenides 11, 12 and reacted with the electron rich alkenes 6 under the reductive (n-Bu(3)SnH/AIBN) conditions to give the functionalized phosphonates 7 in 32 divided by 68% yield. Two fragmentation processes of the phosphonate a-alkoxy alkyl radicals are also described.
A New and Easy Synthesis of Diethyl 2-Formylalkylphosphonates
作者:Marie-Paule Teulade、Philippe Savignac
DOI:10.1055/s-1987-28165
日期:——
Aldimines obtained from 2-alkenals are condensed with triethyl phosphite in ethanol in the presence of formic acid to give diethyl iminoalkylphosphonates; these are readily converted into diethyl formylalkylphosphonates in acidic medium.
Synthesis and antimalarial activity of chain substituted pivaloyloxymethyl ester analogues of Fosmidomycin and FR900098
作者:Thomas Kurz、Katrin Schlüter、Uwe Kaula、Bärbel Bergmann、Rolf D. Walter、Detlef Geffken
DOI:10.1016/j.bmc.2006.04.018
日期:2006.8
Fosmidomycin is a promising antimalarial drug candidate with a unique chemical structure and a novel mode of action. Chain substituted pivaloyloxymethylester derivatives of Fosmidomycin and its acetyl analogueFR900098 have been synthesized and their in vitro antimalarial activity versus the Chloroquine sensitive strain 3D7 of Plasmodium falciparum has been determined.
Reactions of triethyl phosphite with activated olefins
作者:R.G. Harvey
DOI:10.1016/s0040-4020(01)99048-9
日期:1966.1
Reaction of triethylphosphite with a series of α,β-unsaturated esters, ketones, aldehydes, amides and nitriles in protonating solvents proceeds smoothly to furnish β-substituted phosphonate esters. This process, termed hydrophosphinylation, is quite general in contrast to reduction and reductive dimerization, the alternative reaction pathways previously observed for dibenzoylethylene. The most active
ω-Formylalkylphosphonates by acid hydrolysis of the corresponding acetals obtained from triethylphosphite and bromoacetals has been described. In aqueous solution in the presence of cyanide and amines these compounds give aminonitriles (Strecker) or hydantoins (Bucherer). These reactions give access to a large variety of compounds which by acid hydrolysis (Strecker) or basic then acid hydrolysis (Bucherer)