作者:Feng Zhu、Eric Miller、Shuo-qing Zhang、Duk Yi、Sloane O’Neill、Xin Hong、Maciej A. Walczak
DOI:10.1021/jacs.8b11211
日期:2018.12.26
We report a stereoretentive cross-coupling reaction of configurationally stable nucleophiles with disulfide and N-sulfenylsuccinimide donors promoted by Cu(I). We demonstrate the utility of this method in the synthesis of thioglycosides derived from simple alkyl and aryl thiols, thioglycosides, and in the glycodiversification of cysteine residues in peptides. These reactions operate well with carbohydrate
Glycosyl Cross-Coupling of Anomeric Nucleophiles: Scope, Mechanism, and Applications in the Synthesis of Aryl <i>C</i>-Glycosides
作者:Feng Zhu、Jacob Rodriguez、Tianyi Yang、Ilia Kevlishvili、Eric Miller、Duk Yi、Sloane O’Neill、Michael J. Rourke、Peng Liu、Maciej A. Walczak
DOI:10.1021/jacs.7b08707
日期:2017.12.13
highly stereospecific reaction of anomeric nucleophiles. First, methods for the preparation of anomeric stannanes have been developed and optimized to afford both anomers of common saccharides in high anomericselectivities. We established that oligosaccharide stannanes could be prepared from monosaccharide stannanes via O-glycosylation with Schmidt-type donors, glycal epoxides, or under dehydrative
1,2-Metallate Rearrangements of α-Alkoxyalkyl Cuprates
作者:Philip Kocienski、Krzysztof Jarowicki
DOI:10.1055/s-2004-836045
日期:——
α-Alkoxylalkyl cuprates undergo 1,2-metallate rearrangement to give secondary alkyl cuprates.
β-烷氧基烷基铜酸盐发生1,2-金属重排反应,生成仲烷基铜酸盐。
Cephalosporins and homologues, preparations and pharmaceutical
申请人:——
公开号:US06001997A1
公开(公告)日:1999-12-14
.beta.-Lactam antibiotics of formula (I) or a salt thereof, wherein R.sup.1 is hydrogen, methoxy or formamido; R.sup.2 is an acyl group; CO.sub.2 R.sup.3 is a carboxy group or a carboxylate anion, or R.sup.3 is a readily removable carboxy protecting group; R.sup.4 represents up to four substituents; X is S, SO, SO.sub.2, O or CH.sub.2 ; m is 1 or 2; and n is 0, useful in the treatment of bacterial infections. ##STR1##
Cephaloporins and homologues, preparations and pharmaceutical
申请人:Pzifer Inc.
公开号:US06020329A1
公开(公告)日:2000-02-01
.beta.-Lactam antibiotics of formula (I) or a salt thereof, wherein R.sup.1 is hydrogen, methoxy or formamido; R.sup.2 is an acy group; CO.sub.2 R.sup.3 is a carboxy group or a carboxylate anion, or R.sup.3 is a readily removable carboxy protecting group; R.sup.4 represents up to four substituents; X is S, SO, SO.sub.2, O or CH.sub.2 ; m is 1 or 2; and n is 0, useful in the treatment of bacterial infec ##STR1##