Synthesis of some new dispiro[dipyrano-(2,4?:6,4?)bidithiolo(4,5-b:4?,5?-e)-4,8-benzoquinones]
摘要:
The one pot reaction of acetylacetone, CS2, and tetrabromobenzoquinone in a 2:2:1 molar ratio affords 2,6-di-(1-acetyl-2-oxopropylidene)-bidithiolo-(4,5-b:4'5'-e)-4,8-benzoquinone (3) which was allowed to react with some active methylene reagents in a 1:2 molar ratio to give the dispiro derivatives 5-11. The reaction is assumed to proceed via a hydrolysis of the two acetyl groups in compound 3 followed by a nucleophilic addition of the active methylene reagents at the two ethylenic bonds and subsequent cyclization.
Synthesis of some new dispiro[dipyrano-(2,4?:6,4?)bidithiolo(4,5-b:4?,5?-e)-4,8-benzoquinones]
摘要:
The one pot reaction of acetylacetone, CS2, and tetrabromobenzoquinone in a 2:2:1 molar ratio affords 2,6-di-(1-acetyl-2-oxopropylidene)-bidithiolo-(4,5-b:4'5'-e)-4,8-benzoquinone (3) which was allowed to react with some active methylene reagents in a 1:2 molar ratio to give the dispiro derivatives 5-11. The reaction is assumed to proceed via a hydrolysis of the two acetyl groups in compound 3 followed by a nucleophilic addition of the active methylene reagents at the two ethylenic bonds and subsequent cyclization.