Differentially-protected steroidal triamines; scaffolds with potential for medicinal, supramolecular, and combinatorial chemistry
作者:Vicente del Amo、Laura Siracusa、Theodoros Markidis、Beatriz Baragaña、Khadga M. Bhattarai、Marta Galobardes、Gregorio Naredo、M. Nieves Pérez-Payán、Anthony P. Davis
DOI:10.1039/b412298d
日期:——
monoprotection employing 1-(2-nitrobenzenesulfonyloxy)-benzotriazole 29. Regioselectivity of > or 50 : 1 is achieved, presumably reflecting an exceptional sensitivity to steric hindrance. Protection of the remaining amino group as Boc or Alloc gives the scaffolds in approximately 40% overall yield from cholic acid. Scaffold 13 has been sequentially deprotected and derivatised with N-carbamoyl amino acids, to give
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.
Topuzyan, V. O.; Martirosyan, M. S., Journal of Organic Chemistry USSR (English Translation), 1991, vol. 27, # 11.2, p. 2148 - 2153