H-L-allo-Thr(tBu)-OH

H-L-allo-Thr(tBu)-OH is an L-allo stereochemical variant of threonine bearing a tert-butyl-protected side-chain hydroxyl and a free carboxylic acid, providing a chiral amino acid framework with controlled functional-group reactivity. The molecule contains an amino group that is typically handled under N-protection conditions for coupling, alongside a carboxylic acid suitable for activation to form amide bonds. The side-chain O-tert-butyl substituent masks the hydroxyl during peptide coupling and can be removed under acid-mediated deprotection conditions to regenerate the threonine alcohol functionality. The allo configuration relative to standard threonine introduces stereochemical distinction at the α-carbon, enabling access to stereochemically defined peptide and peptidomimetic analogs for structure-function studies and synthetic method development.

1. Peptide Synthesis

H-L-allo-Thr(tBu)-OH supports peptide building workflows where threonine side-chain hydroxyl protection is required to prevent competing reactions during amide bond formation. The protected O-tert-butyl group on the side-chain alcohol allows coupling chemistry to proceed while maintaining chemoselectivity, and the free carboxylic acid can be converted into an activated derivative for peptide coupling to an amino component. The allo stereochemistry at the α-center enables incorporation of stereodefined threonine analogs into linear peptides and protected peptide fragments for subsequent deprotection and functionalization. Downstream, regenerated side-chain hydroxyls can participate in hydrogen-bonding interactions and enable further derivatization to access threonine-based motifs in peptide analog libraries.

2. Amino Acid Derivatization

H-L-allo-Thr(tBu)-OH functions as a chiral amino acid intermediate for side-chain modification strategies that begin with orthogonal protection of the hydroxyl. The tert-butyl-protected alcohol can be retained during initial transformations targeting the amino and carboxyl functionalities, then removed to expose a stereochemically defined secondary alcohol for subsequent esterification, ether formation, or conversion to leaving-group-enabled derivatives. The free carboxylic acid also permits formation of amino acid esters or activated acid intermediates for downstream coupling or incorporation into larger scaffolds. Stereochemical control afforded by the allo configuration can be leveraged to generate diastereomer- and enantiomer-resolved derivatives for synthetic organic chemistry and stereochemical mapping of peptide-like structures.

3. Protected Amino Acids

H-L-allo-Thr(tBu)-OH is suitable for protected amino acid chemistry where orthogonal side-chain protection supports multi-step synthesis and selective deprotection planning. The O-tert-butyl group provides resistance to many coupling conditions while enabling acid-labile removal to regenerate the threonine hydroxyl after peptide assembly or fragment elaboration. The presence of the amino acid backbone with a free carboxyl group allows integration into standard protected amino acid workflows, including conversion to N-protected amino acid forms and subsequent activation for peptide bond formation. The allo stereocenter further enables access to stereochemically distinct protected amino acid building blocks for generating analogs that probe how threonine stereochemistry influences conformational preferences and molecular recognition.

4. Peptidomimetics And SAR

H-L-allo-Thr(tBu)-OH can be applied in peptidomimetic construction and structure-activity relationship studies where controlled stereochemistry and side-chain hydroxyl presence are used to tune binding-relevant interactions. The protected secondary alcohol enables late-stage introduction of hydrogen-bonding or polarity features after assembly of a peptide-like scaffold, supporting SAR-driven library synthesis without premature side reactions. The allo configuration provides a stereochemical handle distinct from standard threonine, enabling systematic comparison of stereochemical effects on conformation and interaction patterns in peptide analog series. The resulting deprotected alcohol can be further transformed into constrained or functionalized substituents to generate SAR panels that map side-chain geometry and reactivity.

5. Process Chemistry Intermediate

H-L-allo-Thr(tBu)-OH is relevant to process chemistry intermediate preparation where orthogonally protected amino acid structures support scalable synthetic routing and controlled chemoselectivity. The tert-butyl-protected hydroxyl helps manage functional-group compatibility during activation of the carboxylic acid and coupling steps, reducing the likelihood of side reactions associated with unprotected alcohols. The chiral amino acid framework and defined allo stereochemistry enable reproducible intermediate generation for downstream manufacturing of protected peptide fragments and amino acid derivatives. The compound's functional-group layout supports conversion into activated acids, esters, or coupling-ready forms within industrial fine chemical synthesis workflows that require predictable deprotection and downstream functional-group availability.

1. The effect of sex on immune responses to a homocitrullinated peptide in the DR4-transgenic mouse model of Rheumatoid Arthritis

2. Novel Peptide-Based PD1 Immunomodulators Demonstrate Efficacy in Infectious Disease Vaccines and Therapeutics

3. Characterization of Novel P-Selectin Targeted Complement Inhibitors in Murine Models of Hindlimb Injury and Transplantation

4. High fat diet and GLP-1 drugs induce pancreatic injury in mice

5. Odorant binding protein based biomimetic sensors for detection of alcohols associated with Salmonella contamination in packaged beef