Catalytic cyanomethylation of carbonyl compounds and imines with highly basic phosphine
作者:Satoru Matsukawa、Eri Kitazaki
DOI:10.1016/j.tetlet.2008.02.155
日期:2008.4
A highly basicphosphine, tris(2,4,6-trimethoxy phenyl)phosphine (TTMPP), catalyzes cyanomethylation using trimethylsilylacetonitrile (TMSCH2CN) to give the corresponding products in good to high yields, with both carbonyl compounds and imines.
A truly catalytic nucleophilic trifluoromethylation reaction of carbonyl compounds with Ruppert’s reagent, Me3SiCF3, has been shown to be efficiently promoted by a P(t-Bu)3-DMF system. Imines were also converted to the desired α-trifluoromethyl amines under similar reaction conditions.
[reaction: see text] The enantioselective copper(II)-catalyzed Friedel-Crafts addition of indoles to N-sulfonyl aldimines was developed using chiral bisoxazoline as ligands, and high enantioselectivities (up to 96% ee) were achieved.
Asymmetric Isothiourea-Catalysed Formal [3+2] Cycloadditions of Ammonium Enolates with Oxaziridines
作者:Siobhan R. Smith、Charlene Fallan、James E. Taylor、Ross McLennan、David S. B. Daniels、Louis C. Morrill、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1002/chem.201501271
日期:2015.7.13
A highly enantioselective Lewis base‐catalysed formal [3+2] cycloaddition of ammonium enolates and oxaziridines to give stereodefined oxazolidin‐4‐ones in high yield is described. Employing an enantioenriched oxaziridine in this process leads to a matched/mis‐matched effect with the isothiourea catalyst and allowed the synthesis of either syn‐ or anti‐stereodefined oxazolidin‐4‐ones in high d.r., yield
Pd-catalyzed addition of arylboronic acids to N-tosylarylimines was described by employing easily prepared, air-stable aminophosphine ligands, cheap inorganic base, and common organic solvents, providing diarylmethylamine derivatives through one-pot synthesis in moderate to good yields. The efficiency of this reaction was demonstrated by the compatibility with nitro, trifluoromethyl, fluoro, chloro, and methoxy groups. Moreover, rigorous exclusion of air/moisture is not required in these transformations.