Efficient Baylis−Hillman Reactions of Cyclic Enones in Methanol As Catalyzed by Methoxide Anion
作者:Sanzhong Luo、Xueling Mi、Hui Xu、Peng George Wang、Jin-Pei Cheng
DOI:10.1021/jo0491760
日期:2004.11.1
The Baylis−Hillman reactions of cyclic enones with a variety of aldehydes were investigated. 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) was found to be a viable catalyst in promoting the reactions of sterically retarded substrates in methanol. The reactions showed clear solvent dependence and only occurred in hydroxylic solvents, especially in methanol. Further consideration on the steric character of
Remarkable Rate Acceleration of Imidazole-Promoted Baylis−Hillman Reaction Involving Cyclic Enones in Basic Water Solution
作者:Sanzhong Luo、Peng George Wang、Jin-Pei Cheng
DOI:10.1021/jo035345p
日期:2004.1.1
The Baylis−Hillmanreaction of cyclic enones was greatly accelerated in basic water solution with imidazoles as catalysts, which resulted in short reaction time, high yields, and expanding substrate scopes. Bicarbonate solution was shown to be the optimal reaction medium for the reaction in this study. The apparent “enhanced basicity” of imidazoles accounted for the rate increase in alkaline solution
Vinyl Anion Equivalents. Part IV. Efficient Synthesis of 2-(1-Hydroxyalkyl)-2-cyclopenten-1-ones
作者:Shinya Kusuda、Yoshio Ueno、Takeshi Toru
DOI:10.1246/bcsj.66.2720
日期:1993.9
Aldol reactions of lithium enolates resulted from conjugate additions of tributylstannyllithium to 2-(phenylseleno)-2-cyclopenten-1-one provides 2-(1-hydroxyalkyl)-2-cyclopenten-1-ones in high yields. Significantly good 1,4-asymmetric induction took place in analogous aldol reactions starting with chiral 4-[(t-butyldimethylsilyl)oxy]-2-(phenylseleno)-2-cyclopenten-1-one.
[DE] 2-ALKYLIDEN- UND 2-(ALKYL-1-EN)-CYCLOPENTANONE ALS RIECHSTOFFE<br/>[EN] 2-ALKYLIDENE- AND 2-(ALKYL-1-ENE)-CYCLOPENTANONE AS PERFUMES<br/>[FR] 2-ALKYLIDENE-CYCLOPENTANONES ET 2-(ALKYL-1-ENE)-CYCLOPENTANONES COMME PARFUMS
申请人:SYMRISE GMBH & CO KG
公开号:WO2006030010A1
公开(公告)日:2006-03-23
Beschrieben wird die Verwendung einer Verbindung der Formel (Ia) oder (Ib), wobei in jeder der Formeln (Ia) und (Ib), R1 H oder Methyl und R2 eine verzweigte oder unverzweigte C1- bis C5-Alkylgruppe ist, als Jasmin-Riechstoff.