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Reactions of 7-(Methoxyimino)-4-methyl-2H-chromene-2,8(7H)-dione with Phosphorus Ylides. Synthesis of 2-Substituted 6-Methyl-8H-benzopyrano[7,8-d]oxazol-8-ones

✍ Scribed by Bezergiannidou-Balouctsi, Catherine ;Litians, Konstantions E. ;Malamidou-Xenikaki, Elizabeth ;Nicolaides, Demetrios N.

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
317 KB
Volume
1993
Category
Article
ISSN
0947-3440

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✦ Synopsis

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 expected Wittig reaction products. However, the reaction of 3 with the stable phosphorus ylides 11a–c in addition to the corresponding benzopyranooxazoles 12a–c and compound 6 affords in the last case compound 16 as well according to a sequence involving an initial Wittig reaction between 11c and 3.

πŸ“œ SIMILAR VOLUMES

ChemInform Abstract: Reactions of 7-Meth
ChemInform Abstract: Reactions of 7-Methoxyimino-4-methylchromene-2,8-dione with Phosphines. Preparation of N-Substituted 7-Amino-8-hydroxy-4-methyl-2H-(1)- benzopyran-2-ones.
✍ D. N. NICOLAIDES; R. W. AWAD; K. E. LITINAS; E. MALAMIDOU-XENIKAKI πŸ“‚ Article πŸ“… 2010 πŸ› John Wiley and Sons βš– 31 KB πŸ‘ 2 views

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