Synthesis of C -pyrimidyl nucleosides starting from alkynyl ribofuranosides
作者:Grégory Legrave、Ramzi Ait Youcef、Damien Afonso、Angélique Ferry、Jacques Uziel、Nadège Lubin-Germain
DOI:10.1016/j.carres.2018.04.005
日期:2018.6
The synthesis of four C-pyrimidyl nucleosides is described by condensation of small nitrogen molecules (amidines and ureas) onto alkynyl riboside derivatives. These last compounds were obtained by indium mediated stereoselective alkynylation of suitably protected ribose derivatives and the condensation reaction conditions were studied in order to favor the N-attack of the nitrogen molecules leading
Synthesis of N-alkoxytrihydroxypiperidine analogs of allopyranose
作者:Lihong Sun、Pan Li、Donald W. Landry、Kang Zhao
DOI:10.1016/0040-4039(96)00068-8
日期:1996.3
Tandem reductive cyclization of O-alkyl oximes provides an efficient method for the preparation of N-alkoxytrihydroxypiperidineanalogs of allopyranose as potential glycosidase inhibitors.
<i>N</i>-Alkoxy Analogues of 3,4,5-Trihydroxypiperidine
作者:Lihong Sun、Pan Li、Nduka Amankulor、Weiping Tang、Donald W. Landry、Kang Zhao
DOI:10.1021/jo971535m
日期:1998.9.1
Two practical procedures are described for the synthesis of the N-alkoxy analogues of 3,4,5-trihydroxypiperidine. The key feature of these methods is the intramolecular N-cyclization of hydroxylamine derivatives which are readily obtained from the reduction of the corresponding oximes. One method is to reductively hydroxyaminate an aldehyde group in the presence of a primary tosylated alcohol which is subsequently cyclized in situ upon neutralization. The intramolecular Mitsunobu coupling of a hydroxylamine with a primary alcohol proved useful for the preparation of compounds which contained the trans diol structure.
Development of a Highly β-Selective Ribosylation Reaction without Using Neighboring Group Participation: Total Synthesis of (+)-Caprazol, a Core Structure of Caprazamycins
作者:Shinpei Hirano、Satoshi Ichikawa、Akira Matsuda
DOI:10.1021/jo701699h
日期:2007.12.1
(+)-caprazol are described. The key elements of our approach include the early stage introduction of the aminoribose in a highly β-selective manner, using the steric hindrance in the transition state and the construction of the diazepanone by a modified intramolecular reductive amination. The 5‘-C-glycyluridine derivative 9, which was prepared stereoselectively via Sharpless asymmetric aminohydroxylation,