Synthesis of Dispiro[Indeno[1,2-<i>b</i>]Quinoxaline-11,3′-Pyrrolizine-2′,2″-[1,3] Thiazolo[3,2-<i>a</i>]Pyrimidine Via Cycloaddition Reactions
作者:Demin Ren、Xiaolian Hu、Yulin Huang、Xiaofang Li
DOI:10.3184/174751918x15349264445767
日期:2018.9
The 1,3-dipolarcycloadditionreaction of ethyl 5-aryl-2-(2-methoxy-2-oxoethylidene)-7-methyl-3-oxo-2,3-dihydro-5H-[1,3]thiazolo[3,2-a] pyrimidine-6-carboxylate and azomethine ylide, which was generated in situ by the reaction of 11H-indeno[1,2-b]quinoxalin-11-one and L-proline, afforded novel 6″ethyl 1′-methyl 5″aryl-7″methyl-3″oxo-5’,6’,7’,7a′-tetrahydro-1'H,3″H,5″H-dispiro[indeno[1,2-b]quinoxaline-11
Synthesis of<i>N</i>1-Substituted 1,2,3,6-Tetrahydropyrimidin- 2-ones via an Unexpected Reaction of Thiazolo[3,2-<i>a</i>]-pyrimidine Derivatives and Nitrile Oxide
作者:Xiaofang Li、Pinggui Yi、Xianyong Yu
DOI:10.1002/cjoc.201090042
日期:2010.1
A new class of N1‐substituted 1,2,3,6‐tetrahydropyrimidin‐2‐ones was prepared in moderate yields by the reaction of nitrile oxide with thiazolo[3,2‐a]pyrimidinederivatives via a domino 1,3‐dipolar cycloaddition/ring‐opening/ substitution process. The structures of the products were characterized thoroughly by IR, elemental analysis, MS, NMR together with X‐ray crystallographic analysis.