A Pd(II)-catalyzed intermolecular C–H silylation reaction initiated by aminopalladation has been developed. The C–H bonds were activated by an alkyl Pd(II) species generated through aminopalladation and then disilylated with hexamethyldisilane to form disilylated indolines as the final products. The reaction provides a new method for the introduction of silylgroups into complex organic molecules.
Stereoselective Synthesis of Pyrrolidine Derivatives via Reduction of Substituted Pyrroles
作者:Chao Jiang、Alison J. Frontier
DOI:10.1021/ol701962w
日期:2007.11.1
hydrogenation of highly substituted pyrrole systems was studied. These aromatic systems could be fully reduced with excellent diastereoselectivity to afford functionalized pyrrolidines with up to four new stereocenters. It is likely that the reaction is a two-step hydrogenation sequence, and that initial reduction of the C=X bond provides a stereocenter that directs the subsequent reduction of the pyrrole.
Specifically, 2-(trichloro)- and (trifluoro)- acetyl-1-methyl pyrroles and ethyl 1-methylpyrrole-2-oxoacetate yield, when treated with paraformaldehyde and hydrogen chloride, and in the absence of any Friedel-Crafts catalyst, the corresponding 4-chloromethyl compounds in high yield and with high regiospecificity. These chloromethylpyrroles are versatile intermediates and offer access to some known
This invention relates to novel compounds having the Formula (I) and to their pharmaceutical compositions and to their methods of use. These novel compounds provide a treatment or prophylaxis of
H. pylori
infection.
Process of reducing a loweralkyl 1-loweralkyl-pyrrole-2-glyoxylate to a loweralkyl 1-loweralkyl-pyrrole-2-acetate
申请人:McNeilab, Inc.
公开号:EP0010553A1
公开(公告)日:1980-05-14
Loweralkyl 1-loweralkyl-pyrrole-2-glyoxylates are reduced by the base-catalyzed action of hydrogen sulfide under pressure of at least 2.11 kg/cm2 to loweralkyl 1- loweralkyl-pyrrole-2-acetates.