Palladium-catalysed N-annulation routes to indoles: the synthesis of indoles with sterically demanding N-substituents, including demethylasterriquinone A1
作者:Anthony J. Fletcher、Matthew N. Bax、Michael C. Willis
DOI:10.1039/b712227f
日期:——
Tandem palladium-catalysed aryl and alkenyl C–N bond formation allows the synthesis of a variety of indoles bearing sterically demanding N-substituents, including the natural product demethylasterriquinone A1.
Total synthesis of cyclomarins A, C and D, marine cyclic peptides with interesting anti-tuberculosis and anti-malaria activities
作者:Philipp Barbie、Uli Kazmaier
DOI:10.1039/c6ob00800c
日期:——
Cyclomarins are cyclic heptapeptides containing four unusual amino acids. New synthetic protocols toward their synthesis have been developed, leading to the synthesis and biological evaluation of three natural occurring cyclomarins. Interestingly, cyclomarins address two completely different targets: Clp C1, a subunit of the caseinolyticprotease of Mycobacteriumtuberculosis (MTB), as well as PfAp3Ase
环豆素是含有四个不同氨基酸的环状七肽。已经开发出用于其合成的新的合成方案,从而导致了三种天然存在的环烷的合成和生物学评估。有趣的是,水手素针对两个完全不同的靶标:Clp C1,结核分枝杆菌(MTB)的酪蛋白水解蛋白酶的亚基,以及恶性疟原虫的PfAp 3 Ase 。因此,对于开发抗结核和疟疾药物而言,水手素是有趣的先导结构。
Synthesis of α,α-Disubstituted Aryl Amines by Rhodium-Catalyzed Amination of Tertiary Allylic Trichloroacetimidates
作者:Jeffrey S. Arnold、Gregory T. Cizio、Hien M. Nguyen
DOI:10.1021/ol202313y
日期:2011.10.21
The rhodium-catalyzed regioselective amination of tertiary allylic trichloroacetimidates with unactivated aromatic amines is a direct and efficient approach to the preparation of α,α-disubstituted allylic aryl amines in good yield and with excellent regioselectivity. This method is applicable to a variety of unactivated primary and secondary amines and allows for the preparation of reverse prenylated
amino acids, constituents of cyclomarin A, are described. The protected N-methylhydroxyleucine 2 was synthesized using Evans’ asymmetric azide-transfer reaction. The unusual amino acid 3 was prepared via diastereoselective methylation of the l-aspartic acid derived lactone 13. The stereoselective formation of threo-β-methoxyphenylalanine 4 was performed viaaldol reaction using Schöllkopf's chiral glycine
Rhodium-Catalyzed N-Reverse Prenylation of Nonactivated Indoles
作者:Minghe Sun、Linsheng Wei、Changkun Li
DOI:10.1055/a-1995-5791
日期:——
N-reverse prenylated indole motif is an important structure in natural products and biologically active molecules. Nevertheless, the direct N-reverse prenylation of nonactivated indoles is challenging. We report a rhodium-catalyzed regioselective N-reverse prenylation of indoles bearing various functional groups under neutral conditions. The triphenyl phosphite ligand and acetonitrile solvent together play