A highly efficient procedure for the preparation of N-sulfonylimines via condensation of sulfonamides with aldehydes as well as ketones in the presence of triarylmethyl chlorides as metal-free organo-catalysts at 40 °C is described. The advantages of this class of catalysts over the reported ones are their efficiency and possibility of running reactions in neutral media that makes them suitable for
Solvent-free synthesis of N-sulfonyl imines using WCl6 as a novel, highly efficient and reusable catalyst
作者:Mohammad Ali Zolfigol、Mahsa Tavasoli、Ahmad Reza Moosavi-Zare、Parastoo Arghavani-Hadi、Abdolkarim Zare、Vahid Khakyzadeh
DOI:10.1039/c3ra40681d
日期:——
WCl6 was used as a novel, efficient and reusablecatalyst for the preparation of N-sulfonyl imines via the condensation of sulfonamides with aldehydes as well as isatin under solvent-free conditions. The turn-over frequency (TOF) value of the catalyst is several times higher than the previously reported catalysts. Clean reaction, simple purification, short reaction time and high yield are some other
Enantioselective Reductive Coupling of Acetylene to <i>N</i>-Arylsulfonyl Imines via Rhodium Catalyzed C−C Bond-Forming Hydrogenation: (<i>Z</i>)-Dienyl Allylic Amines
作者:Eduardas Skucas、Jong Rock Kong、Michael J. Krische
DOI:10.1021/ja0715896
日期:2007.6.13
The first highly enantioselective catalytic vinylation of aldimines to furnish allylic amines is reported. Exposure of aromatic and aliphatic N-arylsulfonyl aldimines 1a−12a to equal volumes of acetylene and hydrogen gas at 45 °C and ambient pressure in the presence of chirally modified cationic rhodium catalysts provides the (Z)-dienyl allylic amines 1b−12b in highly optically enriched form (93−98%
Agent for lightening keratinic fibers, particularly human hair, wherein the agent contains, in a cosmetic carrier, at least one oxidizing agent chosen from hydrogen peroxide and/or a solid addition product thereof with organic or inorganic compounds, and at least one sulfonimine of formula (I)—
Morita−Baylis−Hillman Reaction and Cyclization of 1-(<i>p</i>-Toluenesulfonyl)-1,3-butadiene with Aldimines
作者:Thomas G. Back、Danica A. Rankic、Jovina M. Sorbetti、Jeremy E. Wulff
DOI:10.1021/ol050658n
日期:2005.6.1
underwent Morita-Baylis-Hillman reaction with 1-(p-toluenesulfonyl)-1,3-butadiene (3) in the presence of 3-hydroxyquinuclidine (HQD) to afford adducts 4. The E-isomers of the products cyclized to the corresponding functionalized piperidines 8 under base-catalyzed conditions. Simultaneous equilibration of (E)-4 and (Z)-4 was effected by photoisomerization to improve the efficiency of the cyclization.