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Beilstein J. Org. Chem. 2009, 5, No. 81, doi:10.3762/bjoc.5.81
Graphical Abstract
Figure 1: The conformationally rigid amino acid derivatives 1–3 (β-turn-inducing building blocks) and 4–6 (su...
Figure 2: The targeted tricyclic amino acid derivatives 7 and 8, and the key intermediate 9.
Scheme 1: Synthesis of the racemic ketone rac-9. i) NH4OAc, HOAc, Δ, 4 d, 100%; ii) LiAlH4, THF, Δ, 1 d, 87% [24]...
Scheme 2: Enantioselective hydrosilylation/oxidation of 11. i) HSiCl3, [Pd(C3H5)Cl]2 (0.06 mol %), (R)-MOP (0...
Figure 3: X-ray crystal structure of 9. X-ray data have been deposited with the Cambridge Crystallographic Da...
Scheme 3: Initial route to the aldehyde rac-15. i) MePPh3+Br−, t-BuOK, toluene, Δ, 7 h, 77% or Mg, TiCl4, CH2...
Scheme 4: Assembly of the amino acid 7a•HCl and the N-tosylamide 7b•HCl. i) MeOCH2PPh3+Cl−, t-BuOK, toluene/T...
Scheme 5: Preparation of the amino acid 8a•HCl and the N-tosylamide 8b•HCl. i) TMSCH2CO2Et, LDA, THF, −78 °C ...
Figure 4: X-ray crystal structure of 8a•MeOH. X-ray data have been deposited with the Cambridge Crystallograp...