Synthesis and reactivity of phenyliodonium ylides of benz[b]oxepine-3,5(2H,4H)-diones
摘要:
The reactions of phenyliodonium ylides of cyclic 7-membered beta-diketones bearing two different carbonyl groups with alkynes and nitriles under mild conditions lead to cyclization products and exhibit remarkable regioselectivity. A possible reaction pathway is proposed in order to explain this reactivity.
Synthesis and reactivity of phenyliodonium ylides of benz[b]oxepine-3,5(2H,4H)-diones
摘要:
The reactions of phenyliodonium ylides of cyclic 7-membered beta-diketones bearing two different carbonyl groups with alkynes and nitriles under mild conditions lead to cyclization products and exhibit remarkable regioselectivity. A possible reaction pathway is proposed in order to explain this reactivity.
Phenyliodonium ylids of cyclic β-dicarbonyl compounds react with substituted thioureas to form the corresponding thiouronium ylids. The latter, when they have one free amino group, are converted upon heating to fused thiazoles. The reaction can be considered as a modification of the Hantzsch synthesis.