An Improved Approach to Chiral Cyclopentenone Building Blocks. Total Synthesis of Pentenomycin I and Neplanocin A
作者:John K. Gallos、Christos I. Stathakis、Stefanos S. Kotoulas、Alexandros E. Koumbis
DOI:10.1021/jo050987t
日期:2005.8.1
An improved approach to enantiomerically pure hydroxylated cyclopentenones is reported here, which involves intramolecular nitrone cycloaddition of sugar-derived chiral pent-4-enals and hex-5-en-ones-2 followed by N−O bond cleavage, quaternization of the amine thus produced, and finally oxidative elimination of the amino group. Synthesis of pentenomycin I and neplanocin A is described following this
The present invention relates to the field of organic synthesis and describes the synthesis of specific intermediates suitable for the preparation of triazolopyrimidine compounds such as ticagrelor.
The present invention provides in particular a process for the preparation of a compound of formula V
comprising:
a) providing a compound of formula IV
, and
b) reducing the compound of formula IV with activated zinc in the presence of copper to give the compound of formula V.
The present invention relates to the field of organic synthesis and describes the synthesis of specific intermediates suitable for the preparation of triazolopyrimidine compounds such as ticagrelor.
本发明涉及有机合成领域,并描述了合成特定中间体的方法,适用于制备三唑并嘧啶类化合物,如替卡格雷。
Synthesis and biological evaluation of ticagrelor derivatives as novel antiplatelet agents
作者:Hao Zhang、Jun Liu、Luyong Zhang、Lingyi Kong、Hequan Yao、Hongbin Sun
DOI:10.1016/j.bmcl.2012.04.050
日期:2012.6
Ticagrelor (1) is the first reversible P2Y12 receptor antagonist blocking adenine diphosphate (ADP)-induced platelet aggregation with rapid onset and offset of effects. In this study, synthesis of ticagrelor and its derivatives has been accomplished in a convergent way. The compound design was based on modifications of ticagrelor and its major metabolite (33) in order to ameliorate their pharmacokinetic properties and dosing profile. The final compounds (1a-g, 35a-g) were evaluated for their inhibitory effect on ADP-induced platelet aggregation in rats. The assay results showed that some compounds (e. g., 1b, 1d, 33, 35b, 35f) exhibited comparable potency with that of ticagrelor. (C) 2012 Elsevier Ltd. All rights reserved.