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Synthesis of crown ethers containing a thiazole subcyclic unit

โœ Scribed by Hong-Seok Kim; Ii-Chun Kwon; Jun-Hyeak Choi

Publisher
Journal of Heterocyclic Chemistry
Year
1999
Tongue
English
Weight
299 KB
Volume
36
Category
Article
ISSN
0022-152X

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โœฆ Synopsis

Abstract

Crown ethers containing a thiazole subcyclic unit are prepared from the reactions of 1,3โ€bis[2(4โ€hydroxymethylthiazoyl)]benzene with diโ€pโ€tosylates of corresponding di, tri, tetra, pentaethylene glycols in the presence of potassium hydride. However, if the cavity size in the ring system is small, [2+2] cyclization adduct also is formed.

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## Abstract Five novel pyridonoโ€18โ€crownโ€6 (**10โ€14**) and two new benzyloxyโ€substituted pyridinoโ€18โ€crownโ€6 (**15** and **16**) ligands have been prepared. By the catalytic hydrogenative removal of the benzyl group from the benzyloxy moiety at position 4 of the pyridine ring of **15** and **16**,