Stereodivergent syntheses of the first bis(cyclobutane) β-dipeptides
摘要:
The efficient synthesis of methyl 2-benzyloxycarbonylamino-(1S,2R)-cyclobutane-1-carboxylate starting from 2-methoxycarbonyl-(1R,2S)-cyclobutane-1-carboxylic acid is described. This beta-amino acid derivative is antipodal with respect to the (1R,2S)-compound that was previously synthesized in our laboratory from the same chiral hemi ester. In turn, these enantiomeric beta-amino acids have been self-condensed and coupled with one another to provide, respectively, enantiomeric and diastereomeric bis(cyclobutane) beta-dipeptides. These products are the first reported beta-amino acid oligomers containing two directly linked cyclobutane residues. (C) 2002 Elsevier Science Ltd. All rights reserved.
(+)- and (−)-2-Aminocyclobutane-1-carboxylic Acids and Their Incorporation into Highly Rigid β-Peptides: Stereoselective Synthesis and a Structural Study
作者:Sandra Izquierdo、Federico Rúa、Abdelouahid Sbai、Teodor Parella、Ángel Álvarez-Larena、Vicenç Branchadell、Rosa M. Ortuño
DOI:10.1021/jo0510843
日期:2005.9.1
Several derivatives of (+)- and (−)-2-aminocyclobutane-1-carboxylic acid, 1, have been prepared through enantiodivergent synthetic sequences. The stereoselective synthesis of free amino acid (+)-1 has been achieved, and this product has been fully characterized for the first time. Stereocontrolled alternative synthetic methodologies have been developed for the preparation of bis(cyclobutane) β-dipeptides
Stereoselective Synthesis of All Stereoisomers of Orthogonally Protected Cyclobutane-1,2-diamine and Some Chemoselective Transformations
作者:Marta Sans、Ona Illa、Rosa M. Ortuño
DOI:10.1021/ol300689e
日期:2012.5.18
The four stereoisomers of protected cyclobutane-1,2-diamine have been prepared in an enantio- and diastereocontrolled manner through stereodivergent synthetic routes starting from a half-ester as a common chiral precursor. Orthogonal protection allows the chemoselective manipulation of both amino groups as shown in this work.
Stereodivergent syntheses of the first bis(cyclobutane) β-dipeptides
作者:Sandra Izquierdo、Marta Martı́n-Vilà、Albertina G. Moglioni、Vicenç Branchadell、Rosa M. Ortuño
DOI:10.1016/s0957-4166(02)00652-3
日期:2002.11
The efficient synthesis of methyl 2-benzyloxycarbonylamino-(1S,2R)-cyclobutane-1-carboxylate starting from 2-methoxycarbonyl-(1R,2S)-cyclobutane-1-carboxylic acid is described. This beta-amino acid derivative is antipodal with respect to the (1R,2S)-compound that was previously synthesized in our laboratory from the same chiral hemi ester. In turn, these enantiomeric beta-amino acids have been self-condensed and coupled with one another to provide, respectively, enantiomeric and diastereomeric bis(cyclobutane) beta-dipeptides. These products are the first reported beta-amino acid oligomers containing two directly linked cyclobutane residues. (C) 2002 Elsevier Science Ltd. All rights reserved.