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Novel (E)- and (Z)-2-Styrylchromones from (E, E)-2′-Hydroxycinnamylideneacetophenones – Xanthones from Daylight Photooxidative Cyclization of (E)-2-Styrylchromones

✍ Scribed by Artur M. S. Silva; Diana C. G. A. Pinto; Hilário R. Tavares; José A. S. Cavaleiro; M. Luisa Jimeno; José Elguero

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
402 KB
Volume
1998
Category
Article
ISSN
1434-193X

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✦ Synopsis

E,E)-2Ј-Hydroxycinnamylideneacetophenones / (E)-and (Z)-2-Styrylchromones / Xanthones / Oxidative cyclizations / Configuration determination The oxidative cyclization of (E,E)-2Ј-hydroxycinnamyl-obtained. The stereochemistry of the (E,E)-cinnamylideneacetophenones 1 and (E)-and (Z)-2-styrylchromones 3 and 4 ideneacetophenones 1a-e, and (E,E)-2Ј-benzyloxy-6Јhydroxycinnamylideneacetophenones 1i-l with DMSO/ was established by NOE experiments. The induced daylight photooxidative cyclization of some (E)-2-styrylchromones iodine, gave (E

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Alkylidenebutenolides from a 2-(Trimethylsiloxy)furan and Iodomethacrolein -Stereoselective Synthesis of Z-and E-Freelingyne. -Via an aldol/β-elimination approach as key sequence the title products such as (V) and (VI) are prepared. It is noteworthy that an earlier described method with triflic anh