Condensation of different cyclic ketones with visnaginone la and khellinone lb afforded spirofurochromanone derivatives 2a-f. Compounds 2a and 2b were readily demethylated to give the compounds 3a and 3b. Nitration of 2b and 2e gave the nitrofurochromonone and quinone derivatives 4 and 5 respectivel
Synthesis and Reactions of Some New Spiropyranthiazoline Derivatives
β Scribed by El-Zohry, Maher F.; Elossaily, Yasser A.; Mohamed, Thanaa A.; Hussein, Essam M.
- Book ID
- 121335791
- Publisher
- Taylor and Francis Group
- Year
- 2008
- Tongue
- English
- Weight
- 265 KB
- Volume
- 183
- Category
- Article
- ISSN
- 1042-6507
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## Abstract magnified image Reaction of __visnaginone__ **1** with allyl bromide gave __O__βallyl __visnaginone__ **2** which underwent Claisen rearrangement to yield 7βallylbenzofuran derivative **3**. Reaction of **3** with different aromatic aldehydes gave the corresponding 5βcinnamoylbenzofura
A~,lnitroso ccxnpounds c;isily react ;is nucleophilcs ~ith conjugated azoalkenes to give (~-(arylimino-N-oxide)hydraz~mes by their 1,4-addition to the a~x~-cnc system These adducts undergo an internal hetcr~x:yclizati~m process with pyra;/.ole ring formation to produce 1-alkoxycarbonyl-or I-amintx~l