Controlling Multivalency and Multimodality: Up to Pentamodal Dendritic Platforms Based on Diethylenetriaminepentaacetic Acid Cores
摘要:
A highly versatile synthetic strategy is described to generate multimodal and multivalent platforms based on a diethylenetriaminepentaacetic (DTPA) core. Compounds with different functionalization patterns, from mono- to pentamodal, have been prepared using robust and simple chemistry.
A novel process for the amidation or esterification which comprises reacting a compound having a carboxy group with a compound having an amino or imino group which can be acylated or with a compound having a hydroxy group in the presence of a sulfonic acid ester of the formula: R.sub.1 --SO.sub.2 --OR.sub.2 wherein R.sub.1 is an organic group and R.sub.2 O-- is a residue of a strongly acidic N-hydroxy compound as a condensation agent, and a novel sulfonic acid ester useful as such a condensation agent and a process for the preparation thereof.
Organophosphorus and Nitro-Substituted Sulfonate Esters of 1-Hydroxy-7-azabenzotriazole as Highly Efficient Fast-Acting Peptide Coupling Reagents
作者:Louis A. Carpino、Jusong Xia、Chongwu Zhang、Ayman El-Faham
DOI:10.1021/jo0300183
日期:2004.1.1
with HOAt are excellent coupling reagents for peptide synthesis which are generally superior to their uronium/guanidinium analogues and HOBt- or HODhbt-derived phosphate ester counterparts in minimizing loss of configuration during segment coupling. The phosphinyl analogues are more shelf-stable than the phosphoryl systems. The new reagents have been tested in segment couplings leading to two tripeptides
[EN] PROCESS FOR PREPARING DIASTEREOMERICALLY ENRICHED PHOSPHORAMIDATE DERIVATIVES OF NUCLEOSIDE COMPOUNDS FOR TREATMENT OF VIRAL INFECTIONS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE PHOSPHORAMIDATES ENRICHIS EN DIASTÉRÉO-ISOMÈRES DE COMPOSÉS DE NUCLÉOSIDES, DESTINÉS AU TRAITEMENT D'INFECTIONS VIRALES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2014008236A1
公开(公告)日:2014-01-09
The present invention is directed to a process for preparing diastereomerically enriched nucleoside phosphoramidates having the formula I:
本发明涉及一种制备具有化学式I的对映异构体富集的核苷磷酰胺酯的方法。
PROCESS FOR PREPARING DIASTEREOMERICALLY ENRICHED PHOSPHORAMIDATE DERIVATIVES OF NUCLEOSIDE COMPOUNDS FOR TREATMENT OF VIRAL INFECTIONS
申请人:BRISTOL-MYERS SQUIBB COMPANY
公开号:US20150183818A1
公开(公告)日:2015-07-02
The present invention is directed to a process for preparing diastereomerically enriched nucleoside phosphoramidates having the formula I:
本发明涉及一种制备式I的对映体富集核苷酸磷酰胺酯的方法:
Sulfonamide synthesis using N-hydroxybenzotriazole sulfonate: an alternative to pentafluorophenyl (PFP) and trichlorophenyl (TCP) esters of sulfonic acids
作者:Nani Babu Palakurthy、Bhubaneswar Mandal
DOI:10.1016/j.tetlet.2011.10.107
日期:2011.12
The N-hydroxybenzotriazole (HOBt) sulfonate esters undergo amidation under ambient conditions in the presence of di-isopropylethyl amine. This method can be applied to varieties of amines including sterically hindered amino acid esters in less time with reasonably good yields.HOBt ester of sulfonic acids can be a replacement for pentafluorophenyl and trichlorophenyl ester as well as chloride moiety of sulfonyl chloride for amidation. (C) 2011 Elsevier Ltd. All rights reserved.