Synthesis of di- and trihydroxy proline derivatives from D-glycals: Application in the synthesis of polysubstituted pyrrolizidines and bioactive 1C-aryl/alkyl pyrrolidines
作者:Ashish Kumar Verma、Sateesh Dubbu、Ande Chennaiah、Yashwant D. Vankar
DOI:10.1016/j.carres.2019.02.004
日期:2019.3
O-benzyl protected proline derivatives have been synthesized from D-glycals and 2C-formyl-glycals. One of the di-O-benzyl protected proline derivatives has been utilized for the synthesis of polysubstituted pyrrolizidines via [3 + 2] cycloaddition in a stereoselective manner. Further, we also report on the stereoselective synthesis of biologically active 1C-aryl/alkyl pyrrolidines i.e. 4-epi-radicamine
Synthesis of analogues of hyacinthacines, casuarine and uniflorine A from C-2 formyl galactal
作者:Ashokkumar Palanivel、Suresh Dharuman、Yashwant D. Vankar
DOI:10.1016/j.tetasy.2016.08.017
日期:2016.11
The synthesis of analogues of hyacinthacine, casuarine and uniflorine A is described. The key steps involved in achieving these targets are the zinc mediated Barbier reaction, vinyl Grignard reaction, dihydroxylation and cyclization. All of the synthesized compounds were tested against several glycosidases. Compound 11 showed selective inhibition against alpha-mannosidase (Jack beans) with an IC50 value of 81.2 mu M. On the other hand, compound 33 showed selective inhibition of alpha-glucosidases from Baker's yeast and rice with IC50 values of 68.0 and 96.0 mu M respectively. (C) 2016 Elsevier Ltd. All rights reserved.