Microwave-assisted Suzuki–Miyaura cross-coupling of 2-alkyl and 2-alkenyl-benzo-1,3,2-diazaborolanes
摘要:
Nitrogen-based boronate esters, such as 2-octyl-benzo-1,3,2-diazaborolane, 2-phenethyl-benzo-1,3,2-diazaborolane, and 2-{(1E)-hexenyl}-benzo-1,3,2-diazaborolane have been shown to be suitable coupling partners with arylhalides in microwave accelerated Suzuki cross-coupling reactions. Reaction yields of up to 89% were achieved. The use of a silicon group attached to the nitrogen atom, proved to enhance the reactivity of 2-octyl-benzo-1,3,2-diazaborolane. (C) 2011 Elsevier Ltd. All rights reserved.
One-step method for the synthesis of aryl olefins from aryl aldehydes and aliphatic aldehydes
作者:Hanumant B. Borate、Supriya H. Gaikwad、Ananada S. Kudale、Subhash P. Chavan、Shrikant G. Pharande、Vitthal D. Wagh、Vikram S. Sawant
DOI:10.1016/j.tetlet.2013.01.008
日期:2013.3
A conceptually newone-step reaction affording unexpected aryl olefinic product from aromatic aldehyde, aliphatic aldehyde and malononitrile in the presence of acetic acid-ammonium acetate under mild reaction conditions without using any metal catalyst is reported. This novel reaction was used to prepare a number of substituted aryl olefins including new molecules.
[EN] SINGLE-STEP PROCESS FOR THE PREPARATION OF ARYL OLEFINS<br/>[FR] PROCÉDÉ EN UNE ÉTAPE POUR LA PRÉPARATION D'ARYLOLÉFINES
申请人:COUNCIL SCIENT IND RES
公开号:WO2014073003A1
公开(公告)日:2014-05-15
The present invention relates to the single-step process for the synthesis of aryl olefin compounds of Formula (1) by reacting aryl aldehydes with alkyl aldehydes in presence of malononitrile and acid or base or salt, optionally in presence of solvent.
<i>E</i>- and <i>Z</i>-Selective Transfer Semihydrogenation of Alkynes Catalyzed by Standard Ruthenium Olefin Metathesis Catalysts
作者:Rafał Kusy、Karol Grela
DOI:10.1021/acs.orglett.6b03254
日期:2016.12.2
alkynes to yield alkenes was achieved with commercial first and second generation Hoveyda–Grubbs catalysts and formicacid as a hydrogen donor. This catalytic system is distinguished by its selectivity and compatibility with many functional groups (halogens, cyano, nitro, sulfide, alkenes). The metathetic activity of the rutheniumcatalysts may be utilized in tandem sequences of olefin metathesis plus alkyne
n-pentyl 1-methyl-1H-tetrazol-5-yl (MT) sulfone 1a in the Julia-Kocienski reactions were compared with those of the PT sulfone 1b and the TBT sulfone 1c. The improved stability of the anion derived from the n-pentyl MT sulfone 1a enhanced the efficiency of the olefination reactions and gave higher yields of the product alkenes 3 compared with the PT sulfone 1b. Especially high E-selectivity and high