672-86-6Relevant articles and documents
D-METYROSINE COMPOSITIONS AND METHODS FOR PREPARING SAME
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, (2020/10/20)
The disclosure provides processes for preparing a compound of formula I, comprising reacting a compound of formula II with an aqueous acid in a solvent and at a temperature sufficient for at least about 48 hours to produce a compound of formula I: wherein, R1-R5 are defined herein. Also provided are D-metyrosine prepared according to the processes described herein and compositions comprising the D-metyrosine provided herein.
Novel open-chain and cyclic conformationally constrained (R)- and (S)-α,α-disubstituted tyrosine analogues
Obrecht,Lehmann,Ruffieux,Schonholzer,Muller
, p. 1567 - 1587 (2007/10/02)
A series of novel open-chain and cyclic conformationally constrained (R)- and (S)-α,α-disubstituted tyrosine analogues 1a-e were synthesized in good yields and high optical purities. The absolute configurations of these tyrosine analogues were unambiguously determined based on the X-ray structures of the precursor diastereoisomeric peptides of type 4 and 5. Four of these structures are deseribed, showing β-turn type-I geometries for dipeptides 4b, 5b, and 4c and an extended conformation for peptide 5c. The conversion of the free amino acids 1a-c into suitably protected building blocks 11a-d and 15d,e for peptide synthesis is discussed.