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

Autor:	Konstantions E. Litians, Elizabeth Malamidou-Xenikaki, Demetrios N. Nicolaides, C. Bezergiannidou‐Balouctsi
Rok vydání:	1993
Předmět:	chemistry.chemical_classification chemistry.chemical_compound Chemistry Phosphorus Organic Chemistry Wittig reaction Organic chemistry chemistry.chemical_element 2H-chromene Phosphonium Physical and Theoretical Chemistry Lactone Catalysis
Zdroj:	Liebigs Annalen der Chemie. 1993:1175-1177
ISSN:	1099-0690 0170-2041
DOI:	10.1002/jlac.1993199301190
Popis:	7-(Methoxyimino)-4-methyl-2H-chromene-2,8(7H)-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.
Databáze:	OpenAIRE
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