A short synthesis of the hydantoin-containing marine sponge metabolites axinohydantoins is described. A key feature of the synthesis is a putative biomimetic, intramolecular cyclization of alpha-functionalized imidazolone 5, which affords the tricyclic pyrroloazepinone framework comprising 6. In addition, the conversion of imidazolones to alpha,beta-unsaturated hydantoins is outlined and represents a new approach to these heterocyclic systems.
Palladium-Catalyzed Direct Functionalization of Imidazolinone: Synthesis of Dibromophakellstatin
作者:Jianming Lu、Xianghui Tan、Chuo Chen
DOI:10.1021/ja072844p
日期:2007.6.1
The direct C-H functionalization of imidazolinone is achieved with Pd(OAc)(2)/NaOAc in DMSO. Dibromophakellstatin can be synthesized in five steps with 40% overall yield using this new C-H activation method.
Synthesis of Slagenins A, B, and C
作者:Ana Carolina Barrios Sosa、Kenichi Yakushijin、David A. Horne
DOI:10.1021/ol000233v
日期:2000.11.1
[structure: see text] A short synthesis of the marine sponge metabolites slagenins A (1), B (2), and C (3) is described. The synthetic route features the preparation of beta-hydroxyimidazolone 4 from ornithine and its subsequent oxidative cyclization to the slagenin core.