Stereoselective synthesis of cyclobutyl γ-amino acids leading to branched peptides with a cyclobutane core
摘要:
Alternative synthetic routes are provided to synthesize gamma-amino acids in their free form or conveniently protected for their selective incorporation into ramified gamma-peptides with a cyclobutane core. The key synthetic-step involves the stereoselective conjugate addition of nitromethane to chiral cyclobutyl alkenoates prepared from (-)-verbenone. (C) 2008 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of cyclobutyl GABA analogues and related compounds from (−)-(S)-verbenone
作者:Albertina G. Moglioni、Beatriz N. Brousse、Angel Álvarez-Larena、Graciela Y. Moltrasio、Rosa M. Ortuño
DOI:10.1016/s0957-4166(02)00137-4
日期:2002.4
The highly stereoselective conjugate addition of nitromethane to α,β-unsaturated cyclobutyl esters derived from (−)-(S)-verbenone has been executed to afford the adducts as single stereoisomers in good yields. These products furnish cyclobutyl GABA analogues and γ-lactams which, in turn, can be used as precursors of pyrrolidines. Moreover, both the enantiopure γ-nitro esters and the derived γ-amino
Divergent synthetic routes to biologically relevant types of compounds: chiral polyfunctional γ-lactams and amino acids
作者:Jordi Aguilera、Albertina Moglioni、Àlex Mor、Jimena Ospina、Ona Illa、Rosa M. Ortuño
DOI:10.1016/j.tet.2014.07.011
日期:2014.9
and versatile synthetic routes leading to the title compounds are described. They start from a common chiral precursor derived from (−)-(S)-verbenone and afford polyfunctional γ-lactams and γ- and ε-amino acids. The cyclobutane moiety in these molecules acts as a chiral and polyfunctional platform providing stereogenic centres with unambiguous absolute configuration that control the chirality of the