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Synthesis of [2-Aryl-6-oxo-6H-chromeno[6,7-d]oxazol-8-yl]-acetic Acid Ethyl Esters.

✍ Scribed by Milan Cacic; Mladen Trkovnik; Frane Cacic; Elizabeta Has-Schoen


Publisher
John Wiley and Sons
Year
2006
Weight
21 KB
Volume
37
Category
Article
ISSN
0931-7597

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Reactions of 7-(Methoxyimino)-4-methyl-2
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## Abstract 7‐(Methoxyimino)‐4‐methyl‐2__H__‐chromene‐2,8(7__H__)‐dione (3) reacts with phosphonium salts 1a–c, 8a, b under phasetransfer catalysis conditions to afford the title 2‐substituted 6‐methylbenzopyranooxazol‐8‐ones 5a–c, 10a, b, respectively, along with compound 6, instead of the expecte