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Basic amines contained in drug discovery molecules are prone to ionization at physiological pH, leading to reduced lipophilicity, which is believed to affect membrane permeability and oral absorption. Furthermore, basic molecules can cause hERG inhibition and strongly bind to α-acidic glycoproteins, resulting in a decrease in the free drug concentration in plasma. "SpiroKit1" consists of derivatives of nitrogen-containing heterocyclic compounds such as azetidine, and by replacing these derivatives with parts of drug discovery molecules, it is possible to freely adjust the pKa. This adjustment can optimize issues related to hERG inhibition and cellular permeability. *For more details, please refer to the PDF materials or feel free to contact us.*

Aryl amines are commonly used structures in screening libraries, but they tend to generate highly reactive metabolites, which can become problematic in the later stages of drug development. Additionally, many sp2-rich molecules fail to achieve excellent pharmacokinetic properties. To address these specific issues associated with sp2 carbons, "SpiroKit2" has been developed. This kit consists of sp3-rich linkers that can mimic benzene ring structures and includes bicyclo[1.1.1]pentane derivatives and cubane derivatives. By introducing these structures into drug discovery molecules, the proportion of sp3 carbons within the molecule increases, allowing for improved solubility and the adjustment of lipophilicity. Moreover, compared to sp2-rich structures that adopt planar conformations, sp3-rich structures possess three-dimensional chemical space, enabling the adjustment of the stereochemical shape of drug discovery molecules. These changes in physical properties yield positive results for pharmacokinetic characteristics. *For more details, please refer to the PDF document or feel free to contact us.*

Stereochemically restricted amino acids have become one of the fundamental building blocks in modern drug discovery chemistry, allowing for the expression of important structural features in drug design by controlling the conformation of side chains in these amino acids. Specifically, by combining amines and carboxylic acids functionalized at chiral centers with side chains that have restricted stereoconformation, it is possible to achieve unique three-dimensional structures with functionality. In this way, restricted amino acids provide diverse information for investigating structure-activity relationships and are essential components in peptide mimetics. Additionally, due to their unique three-dimensional structures, these amino acids serve as special motifs to enhance pharmacological activity, selectivity, and ADME, and are expected to improve membrane permeability, oral bioavailability, and metabolic stability. 【SpiroKit3 Features】 ■ Composed of stereochemically controlled amino acids ■ In addition to α,α-disubstituted amino acids, special amino acids with β-amino acids and spiro rings as their framework are also included. *For more details, please refer to the PDF document or feel free to contact us.

In general, building blocks in drug discovery chemistry include scaffolds such as piperidine, piperazine, morpholine, and thiomorpholine. "SpiroKit4" employs azaspiro[3.3]heptane derivatives as alternatives to these scaffolds. By replacing the monocyclic heterocyclic portions contained in drug discovery molecules with spiro[3.3]heptane derivatives, it is possible to uniquely adjust the physicochemical and biochemical properties of the drug discovery molecules. These adjustments enable the exploration of new chemical spaces, and there are reports of improvements in metabolic stability and ADME using this method. *For more details, please refer to the PDF materials or feel free to contact us.*