Direct Carbon−Carbon Bond Formation via Soft Enolization: A Facile and Efficient Synthesis of 1,3-Diketones
摘要:
Ketones undergo soft enolate formation and acylation on treatment with MgBr2 center dot OE2, i-Pr2NEt, and various acylating agents to give 1,3-diketones. The process is particularly efficient for N-acylbenzotriazoles and O-Pfp esters, and, in these cases, is conducted with untreated, reagent-grade CH2Cl2 open to the air, thus providing an exceptionally simple approach to the synthesis of this important class of compounds.
Ketones undergo soft enolization and acylation on treatment with MgBr2·OEt2, i-Pr2NEt, and various acylating agents to give 1,3-diketones. The process is particularly efficient for N-acylbenzotriazoles and O-pentafluorophenyl esters, and, in these cases, is conducted using untreated, reagent grade CH2Cl2 open to the air, thus providing an exceptionally simple approach to the synthesis of this important class of compounds.
A FACILE SYNTHESIS OF 1,3-DICARBONYL COMPOUNDS FROM 1-ALKYNE AND ACID ANHYDRIDE PROMOTED BY DICHLORO-BIS(TRIFLUOROMETHANESULFONATO)TITANIUM(IV)
作者:Yoo Tanabe、Teruaki Mukaiyama
DOI:10.1246/cl.1985.673
日期:1985.5.5
1,3-Dicarbonyl compounds are prepared in high yields by acylation of 1-alkyne derivatives with acid anhydride in the presence of dichloro-bis(trifluoromethanesulfonato)titanium(IV), followed by aqueous work up.
A Novel Synthesis of 1,3-Diketones by Reaction of an α-Bromoketone with Acyl Chlorides Promoted by Gallium Triiodide
作者:Rener Chen、Huayue Wu、Yongmin Zhang
DOI:10.1039/a904972j
日期:——
Promoted by galliumtriiodide, an α-bromoketone, bromomethyl phenyl ketone, is treated with acyl chlorides to synthesize 1,3-diketones in good yields under mild and neutral conditions.
An effective phosphine-catalyzed protocol has been established for the syntheses of 1,3-diketones and nitriles from alkynones with oximes as hydroxide surrogates. This method features the use of a phosphine catalyst, compatibility with various functional groups and ambient temperature, which makes this approach very practical. A plausible mechanism was proposed.