Efficient synthesis of (S)-3,4-dihydro-2-pivaloyloxymethyl-2H-pyrrole 1-oxide
摘要:
A convenient synthesis of the title nitrone is reported. The sequence starts from ethyl L-pyroglutamate as the source of chirality and the key step is the generation of an unstable alpha-methoxy-N-carboxylate ion. Which readily decomposes to an imine. The oxidation of the imine with methyl(trifluoromethyl)dioxirane provides the enantiopure nitrone, which is trapped with dimethyl acetylenedicarboxylate. (C) 2002 Elsevier Science Ltd. All rights reserved.
An efficient synthesis of substituted prolines by the selective reduction and reductive cyanation of 2-pyrrolidones
摘要:
Substituted pyrrolidones undergo selective reduction using Cp2ZrHCl (Schwartz's reagent) to form Delta(1)-pyrrolines, which can be isolated or directly cyanated and hydrolyzed to the corresponding proline. Short syntheses of glutamic semialdehyde (ethyl ester), the marine metabolite (2S,5S)-pyrrolidine-2,5-dicarboxylic acid, and the conformationally constrained amino acid 5,5-dimethylproline, are reported. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis of (S)-3,4-dihydro-2-pivaloyloxymethyl-2H-pyrrole 1-oxide
作者:Pedro de March、Marta Figueredo、Josep Font、Timothy Gallagher、Sergio Milán
DOI:10.1039/c39950002097
日期:——
The synthesis of a series of new enantiopure 3,4-dihydro-2H-pyrrole derivatives including the title nitrone and its cycloaddition product to dimethyl acetylenedicarboxylate is described.
Efficient synthesis of (S)-3,4-dihydro-2-pivaloyloxymethyl-2H-pyrrole 1-oxide
作者:Félix Busqué、Pedro de March、Marta Figueredo、Josep Font、Timothy Gallagher、Sergio Milán
DOI:10.1016/s0957-4166(02)00110-6
日期:2002.3
A convenient synthesis of the title nitrone is reported. The sequence starts from ethyl L-pyroglutamate as the source of chirality and the key step is the generation of an unstable alpha-methoxy-N-carboxylate ion. Which readily decomposes to an imine. The oxidation of the imine with methyl(trifluoromethyl)dioxirane provides the enantiopure nitrone, which is trapped with dimethyl acetylenedicarboxylate. (C) 2002 Elsevier Science Ltd. All rights reserved.
An efficient synthesis of substituted prolines by the selective reduction and reductive cyanation of 2-pyrrolidones
作者:Qian Xia、Bruce Ganem
DOI:10.1016/s0040-4039(02)00097-7
日期:2002.2
Substituted pyrrolidones undergo selective reduction using Cp2ZrHCl (Schwartz's reagent) to form Delta(1)-pyrrolines, which can be isolated or directly cyanated and hydrolyzed to the corresponding proline. Short syntheses of glutamic semialdehyde (ethyl ester), the marine metabolite (2S,5S)-pyrrolidine-2,5-dicarboxylic acid, and the conformationally constrained amino acid 5,5-dimethylproline, are reported. (C) 2002 Elsevier Science Ltd. All rights reserved.