Synthèse de diènes-1,4 fonctionnalisés par addition de zinciques allyliques fonctionnalisés sur des alcynes vrais et leur cyclisation en hétérocycles ou carbocycles
Organocatalyzed Synthesis of α-(Substituted Methyl)vinylphosphonates
作者:Mireille Attolini、Michel Maffei、Cécile Garzon
DOI:10.1055/s-0030-1260176
日期:2011.10
α-(Substituted methyl)vinylphosphonates are obtained by a DABCO-catalyzed substitution reaction of diethyl α-(tert-butoxycarbonyloxymethyl)vinylphosphonate and (N-protected) amino- or soft pronucleophiles. The reactions are easily performed under mild conditions (r.t., 1 h), and give good to excellent yields of the title compounds. A diphosphonate by-product was isolated in some examples, when the
DIMETHYL 3-CHLOROPROP-1-EN-2-YLPHOSPHONATE. PART 3. ALKYLATION OF ANIONIC O AND C NUCLEOPHILES AND PREPARATION OF 1-ALKENYL-2-PHOSPHONATES
作者:Igor E. Gurevich、John C. Tebby、Alla V. Dogadina、Boris I. Ionin
DOI:10.1080/10426509908037001
日期:1999.5.1
methoxide, ethoxide, thiocyanate, methyl and ally1 Grignardreagents and acetamidomalonate—the latter reactions leading to 2-phosphorylated 1-butene, 1,5-hexadiene and C-alkylated α-aminoacids. Diethyl malonate and ethyl acetoacetate give mixtures of mono and dialkylated products whereas ethyl cyanoacetate gives only dialkylated product. Acetylacetone gives a dialkylated product - the monoalkylated intermediate
Efficient synthesis of allylamines from a novel (E)-2,3-difunctionalized allyl bromide
作者:Maha Ameur、Aïcha Arfaoui、Hassen Amri
DOI:10.3998/ark.5550190.p008.392
日期:——
We report a new procedure for highly stereoselective synthesis of difunctionalized allyl and vinyl bromides E-4 and E-5 via a tandem reaction of bromination-dehydrobromination of tetraethyl prop-2-ene-1,2-diyldiphosphonate in the presence of DBU in acetonitrile at room temperature. The coupling reaction of allylbromide E-4 with various primary amines in methanol at 0 °C, followed by S N2’ reaction
我们报告了一种新的高立体选择性合成双官能化烯丙基和乙烯基溴化物 E-4 和 E-5 的新方法,通过在乙腈中 DBU 存在下,四乙基丙-2-烯-1,2-二基二膦酸酯的溴化-脱溴化氢的串联反应在室温下。在 0 °C 下,烯丙基溴 E-4 与各种伯胺在甲醇中的偶联反应,然后是 S N2' 反应,提供了一个新的 1-(烷基氨基)丙-2-烯-1,2-二基二膦酸四乙酯家族 6高产。
A practical synthesis of diethyl 1-[(alkylamino)(cyano)methyl]vinylphosphonates
作者:Asma Fray、Jihène Ben Kraïem、Abdelaziz Souizi、Hassen Amri
DOI:10.3998/ark.5550190.0013.811
日期:——
A simple, convenient and highly stereoselectivesynthesis of diethyl (E)-1-(bromomethyl)-2cyanovinylphosphonate 4 is described. The product would be a useful substrate for the synthesis of diethyl 1-[(alkylamino)(cyano)methyl]vinylphosphonates 5 via allylic rearrangement SN2 -type mechanism.
Allylphosphonates by Heteroanalogous Zinc-Silver/Graphite Mediated Dreiding-Schmidt Reactions
作者:René Csuk、Christina Schröder
DOI:10.1080/07328309908543996
日期:1999.1.1
Allylphosphonates can be prepared in high yields, under mild conditions and in a stereospecific way by the reaction of uloses or dialdohexoses with l-bromo-2-propenyl phosphonate and the highly active zinc-silver/graphite surface compound.