The Diels-Alder Approach for the Synthesis of Tetralin-Based α-Amino Acid Derivatives and their Modification by the Suzuki-Miyaura Cross-Coupling Reaction
作者:Sambasivarao Kotha、Arun Kumar Ghosh
DOI:10.1055/s-2004-815987
日期:——
peptides. Due to the nonavailability of simple synthetic methods to deliver complex cyclic AAAs, only simplest members of this class have been used in the peptide area. In this regard, we have developed a new method to prepare various highly functionalized tetralin-based unusual AAA derivatives 22, 37-43 by trapping o-xylylene (or o-quino-dimethane) intermediate with methyl 2-acetamidoacrylate (12). In addition
The development of an intermolecular aza-Diels–Alder (DA) cycloaddition of sultines and imines is reported. By exploiting sultines as o-quinodimethane precursors and aryl imines as dienophiles in the presence of Cu(OTf)2, an aza-DA reaction proceeds to provide a wide variety of 3-aryl tetrahydroisoquionlines in moderate to excellent yield (up to 89%). The synthetic utility of these products was demonstrated
The development of an oxa-Diels–Alder reaction between sultines and carbonyl compounds is reported. o-Quinodimethanes, generated from sultines, undergo a [4+2]-cycloaddition with activated aldehydes or ketones in the presence of Cu(OTf)2 to provide a variety of functionalized isochromans, including spiroisochromans, in up to 99% yield. The developed protocol demonstrates broad functional-group compatibility
Tetralin-based constrained alpha-amino acid derivatives were prepared via [4 + 2]-cycloaddition reaction as a key step. Here sultine is used as a latent diene and 2-acetamidoacrylate serves as a dienophile component. (C) 2000 Elsevier Science Ltd. All rights reserved.