The DDQ mediated cyclisation products derived from 2-hydroxy-3-(1'-alkenyl)-1,4-napthoquinones viz. (17) under bar were found to be temperature dependent. At 60degreesC the naphthofuranquinone (19) under bar was the predominant isomer whereas at 8degreesC, the naphthopyranquinone (18) under bar was exclusively formed.
CONDENSATION PRODUCTS BETWEEN CAPROALDEHYDE AND 2-HYDROXY-1,4-NAPHTHOQUINONE
作者:Kyatanahalli S. Nagabhushana、Farouk Ameer、Ivan R. Green
DOI:10.1081/scc-100103261
日期:2001.1
Reaction between caproaldehyde 2 and 2-hydroxy-1,4-naphthoquinone 1 under both acidic and basic conditions resulted in the formation of useful compounds including the desired 2-hydroxy-3(1'-hexenyl)-1,4-naphthoquinone 3. The varied results on the reaction conditions and factors affecting the reaction are discussed.