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.
Synthesis of Axinohydantoins
作者:Ana Carolina Barrios Sosa、Kenichi Yakushijin、David A. Horne
DOI:10.1021/jo020063v
日期:2002.6.1
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.
Synthesis of dibromophakellstatin and dibromoisophakellin
作者:Kevin J Wiese、Kenichi Yakushijin、David A Horne
DOI:10.1016/s0040-4039(02)00966-8
日期:2002.7
A short synthesis of the marine sponge alkaloids dibromophakellstatin (1) and dibromoisophakellin (2) is described. The synthesis of 1 centers on a putative biomimetic oxidative cyclization of imidazolone 5. Thermal rearrangement of dibromophakellin (9) in the presence of K2CO3 afforded dibromoisophakellin (2).
描述了海洋海绵生物碱dibromophakellstatin(1)和dibromoisophakellin(2)的简短合成。1的合成以咪唑啉酮5的拟仿生氧化环化为中心。在存在K 2 CO 3的情况下,对二溴邻苯并菲林(9)进行热重排,得到二溴异邻苯并菲林(2)。