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- W2034456773 abstract "Proline, 4-hydroxyproline, azetidine-2-carboxylic acid, pipecolic acid and proline containing dipeptides were converted to N-t-butyloxycarbonyl, O-phenacyl derivatives in a one pot synthesis. 1H - and 13C -NMR spectroscopy of certain derivatives (Boc-Pro-PE, Boc-4Hyp-PE, Boc-Pro-4BrPE and Boc-Pip-PE) in CDC13 solution reveal the presence of cis-trans isomers in almost equal quantities. On the contrary, the 1 H- and 13C -NMR spectra of the N-t-butyloxycarbonyl phenacyl ester of azetidine-2-carboxylic acid, show the presence of one isomer only. Similarly, only one urethane isomer was observed in solution for the protected C-terminal angiotensin II dipeptides, N-t-Boc-Pro-Phe-PE and N-t-Boc-Pro-Ile-PE. All phenacyl derivatives exhibited magnetic asymmetry attributed to steric factors." @default.
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- W2034456773 date "1990-01-01" @default.
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- W2034456773 title "One pot synthesis and conformation of N-t-butyloxycarbonyl, O-Phenacyl derivatives of proline and other secondary amino acids" @default.
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- W2034456773 doi "https://doi.org/10.1016/s0040-4020(01)85437-5" @default.
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