Figure 1 NDTP structural formula
I. Molecular Properties of NDTP:
NDTP is a mildly irritant, highly efficient condensation reagent operating under gentle reaction conditions. It catalyse the formation of amide and ester bonds within one minute, significantly enhancing reaction efficiency. Furthermore, NDTP is recyclable: reaction by-products can be recovered via simple filtration and reconverted into NDTP through a two-step process for reuse. This substantially reduces operational costs and aligns with green chemistry principles.
Figure 2 NDTP Recovery Pathway
II. Mechanism of Action of NDTP:
The mechanism of action of NDTP is as follows: Under the action of a base, carboxylic acids react with NDTP to generate two reactive intermediates: activated carboxylic acid esters and acyl thiocyanates. These intermediates further react with amines or alcohols to efficiently generate the corresponding amide and ester compounds.
Figure 3 Mechanism of action of NDTP
III. Functions of NDTP:
1. NDTP promotes amide synthesis
(1) Efficient and convenient dipeptide synthesis
NDTP can be used for dipeptide coupling reactions of various types of protected amino acids and amino acid methyl ester hydrochloride. It is suitable for nonpolar amino acids, polar amino acids and basic amino acids. Under mild conditions, the corresponding dipeptides are obtained in excellent yield within 1 minute without racemization and with good stereoselectivity.
Figure 4 NDTP promotes dipeptide synthesis
(2) Easy construction of challenging amides
For substrates such as sterically hindered amines and aromatic amines that are difficult to convert efficiently by traditional methods, NDTP also performs well. It can achieve efficient amidation of various carboxylic acids and complex amines, with yields generally at a medium to high level.
Figure 5 NDTP promotes the synthesis of challenging amides
(3) Fmoc-solid phase peptide synthesis
NDTP can also be applied to Fmoc-solid phase synthesis. On Rink Amide MBHA resin, the coupling of amino acids can be completed within 3 minutes, and this has been verified in 5-12 active peptides, fully demonstrating its high efficiency and compatibility in solid phase synthesis.
Figure 6 NDTP used in Fmoc-solid phase synthesis
2. NDTP promotes ester synthesis
(1) Lower alcohols as solvents
In esterification reactions involving lower alcohols, they can be used directly as solvents. With the participation of NDTP, they can react with various carboxylic acids (such as nitrogen-containing heterocycles, dicarboxylic acids, unsaturated carboxylic acids, and various drug molecules) to form ester bonds. The yields are generally high, but the yields of electron-rich aromatic acids (such as methylbenzoic acid) are low.
Figure 7 NDTP promotes the synthesis of lower alcohols
(2) Acetonitrile as solvents
In esterification reactions involving higher alcohols, acetonitrile is used as a solvent. With the participation of NDTP, it reacts with carboxylic acids to form ester bonds. Its application range is wider and it is suitable for the efficient synthesis of primary alcohols, secondary alcohols, phenols, and lactones. Various drug molecules containing carboxyl or hydroxyl groups can also be esterified in good yields.
Figure 8 NDTP promotes the synthesis of higher alcohols
In summary, NDTP is a highly efficient condensation reagent with mild reaction conditions, a wide range of applications, and recyclability. NDTP exhibits superior performance in both amidation and esterification reactions, demonstrating significant potential, particularly in the synthesis of complex substrates and drug molecules. As a novel condensation reagent with significant scientific research value and practical application prospects, NDTP provides strong support for promoting green pharmaceutical manufacturing and the development of peptide drugs.
Suzhou Highfine Biotech Co., Ltd. (Stock Code: 301393.SZ), founded in 2003 and headquartered in Suzhou High-tech Zone, is a national high-tech enterprise providing specialty raw materials to global pharmaceutical R&D and manufacturing companies. Its products are mainly used in peptide, nucleotide, and pharmaceutical synthesis, covering a wide range of condensation agents for specialty amide bond formation, protective agents, linkers, protein cross-linking agents for antibody-drug conjugates, molecular building blocks, liposomes, and phosphorus reagents. Currently, it has developed and produced over 1500 products.
After more than two decades of unremitting efforts and accumulation, Highfine Biotech has continuously deepened its expertise in the global peptide synthesis reagent field and has now developed into a leading enterprise with extensive customized product coverage and significant advantages in large-scale production, capable of meeting the specific needs of various customers. We sincerely invite customers interested in this product to contact us for further information and to discuss cooperation opportunities.
References:
[1] NDTP Mediated Direct Rapid Amide and Peptide Synthesis without Epimerization.
DOI: 10.1021/acs.orglett.1c04258.
[2] Fast Esterification Method Mediated by Coupling Reagent NDTP.
DOI: 10.1021/acsomega.4c09365.
