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
<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.