cis-4-Hydroxy-D-proline is a non-proteinogenic proline derivative featuring a pyrrolidine ring bearing a hydroxyl substituent at the 4-position and a cis relationship between the ring and substituent stereochemical elements, with D stereochemistry indicated at the proline carbon framework. The molecule contains both an amino group and a carboxyl group along with a secondary alcohol side-chain that can form hydrogen bonds and participate in stereochemically defined peptide backbone conformations. cis-4-Hydroxy-D-proline is used in peptide synthesis and structure-activity studies to introduce a hydroxyl-bearing, conformationally constrained residue for preparing modified peptides, crosslinking-capable analogues, or analytical standards for stereochemically characterized proline derivatives.
cis-4-Hydroxy-D-proline is a D-configured, ring-constrained amino acid featuring a pyrrolidine backbone with a cis-oriented 4-hydroxyl substituent relative to the carboxyl-bearing stereocenter. The molecule presents a secondary alcohol and a carboxylic acid that can be orthogonally protected to tune chemoselectivity during peptide coupling and subsequent functional-group transformations. The rigid proline scaffold and defined stereochemistry support stereocontrolled incorporation into peptide chains, where the hydroxyl group can participate in hydrogen-bonding and provide a handle for derivatization. The constrained cyclic structure also makes cis-4-Hydroxy-D-proline a practical chiral intermediate for building hydroxylated proline motifs used in peptide analog synthesis and downstream synthetic elaboration.
1. Peptide Synthesis
cis-4-Hydroxy-D-proline is applied in peptide synthesis and peptidomimetic construction as a hydroxylated proline building block with a stereodefined cis-relationship that can influence backbone conformation. The carboxylic acid and secondary alcohol enable standard N- and C-protection strategies, allowing controlled peptide coupling while preserving the hydroxyl for either later deprotection or selective functionalization. The proline ring supports amide bond formation under common coupling chemistries after appropriate protection, and the cis-4-hydroxyl can be retained to modulate solubility and intramolecular hydrogen bonding in the resulting peptide. Incorporation into short peptides and scaffold libraries supports structure-activity relationship studies focused on proline hydroxyl effects and stereochemical constraints.
2. Amino Acid Derivatization
cis-4-Hydroxy-D-proline is used for amino acid derivatization in synthetic organic chemistry where the secondary alcohol serves as a reactive functional handle for conversion into protected ethers, esters, or activated leaving-group derivatives. The D-stereocenter and cis geometry allow preparation of stereochemically consistent derivatives that can be carried through multi-step sequences without racemization when suitable protecting-group and activation conditions are selected. The carboxyl functionality can be transformed into amino acid esters or activated acids to support downstream coupling to amines, alcohols, or heteroatom nucleophiles. Resulting hydroxylated proline derivatives can function as biochemical research intermediates, chiral building blocks, and process chemistry intermediates for fine chemical synthesis.
3. Chemical Biology Probes
cis-4-Hydroxy-D-proline is suitable for chemical biology probe development and biomolecule modification because the hydroxylated proline motif can be incorporated into peptides used to probe recognition, folding, or binding interfaces. The cyclic proline scaffold provides a conformationally restricted element that can be conjugated through the carboxyl-derived handle after protection/deprotection sequences and coupling to linkers. The secondary alcohol can be selectively functionalized to introduce orthogonal tags for labeling workflows, including attachment points for affinity probes or detection handles. Downstream derivatives enable generation of stereochemically defined peptide conjugates for mapping interaction motifs and supporting mechanistic studies in biochemical research.
4. Peptidomimetics And SAR
cis-4-Hydroxy-D-proline is employed in peptidomimetic construction and SAR studies as a chiral, hydroxyl-bearing proline analog that can be introduced into constrained peptide-like frameworks. The cis-4-hydroxyl group can be maintained to preserve hydrogen-bonding patterns or converted into alternative functional groups to probe the role of polarity and steric orientation in target binding. The D-configuration supports stereochemical matching to proline-containing motifs encountered in bioactive peptide scaffolds, while the ring constraint can reduce conformational entropy in designed analogs. Synthesized analog sets derived from cis-4-hydroxy-D-proline can serve as structure-defined reagents for SAR-driven optimization and for generating matched stereochemical series in medicinal chemistry research.
5. Pharmaceutical Intermediate Preparation
cis-4-Hydroxy-D-proline is relevant to pharmaceutical intermediate preparation and process chemistry intermediate design due to its well-defined stereochemistry and protected-group compatibility for scalable synthetic routes. The amino acid functionality can be converted into N-protected forms and, when required, into carboxyl-activated intermediates that support controlled peptide coupling or further derivatization toward hydroxylated proline fragments. The secondary alcohol can be selectively protected to prevent side reactions during amide bond formation, then deprotected or transformed in later steps to reach target intermediates. Industrial chemical manufacturing workflows can use cis-4-hydroxy-D-proline as a chiral precursor for producing hydroxylated proline-containing building blocks used in fine chemical synthesis and specialty intermediate production.
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