ZnCl2 Promoted Formal (3+2) Cycloaddition Reactions of 2-Alkoxy-1,4-benzoquinones with 2H-Chromenes

ZnCl2 Promoted Formal (3+2) Cycloaddition Reactions of 2-Alkoxy-1,4-benzoquinones with 2H-Chromenes

A simple, mild, inexpensive and highly efficient method for the synthesis of 2,2-dimethyldihydropyranopterocarpans (4a-h and 5a-b) by formal (3+2) cycloaddition reactions of 2-alkoxy-1,4-benzoquinones (3a-b) with 2H-chromenes (1a-d and 2) using ZnCl 2 at room temperature has been developed.

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Veröffentlicht in:Synthetic communications 1996-01, Vol.26 (15), p.2881-2893
Hauptverfasser: Subburaj, Kandasamy, Murugesh, Modachur G., Trivedi, Girish K.
Format: Artikel
Sprache:eng
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Beschreibung
Zusammenfassung:A simple, mild, inexpensive and highly efficient method for the synthesis of 2,2-dimethyldihydropyranopterocarpans (4a-h and 5a-b) by formal (3+2) cycloaddition reactions of 2-alkoxy-1,4-benzoquinones (3a-b) with 2H-chromenes (1a-d and 2) using ZnCl 2 at room temperature has been developed.
ISSN:0039-7911
1532-2432
DOI:10.1080/00397919608005223