W(CO)5(L)-catalyzed formal cope rearrangement of allenyl silyl enol ethers

W(CO)5(L)-catalyzed formal cope rearrangement of allenyl silyl enol ethers
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DOI:
10.1021/ol0473694
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发表时间:
2005-04-14
期刊:
影响因子:
5.2
通讯作者:
Iwasawa, N
Iwasawa, N
中科院分区:
化学1区
文献类型:
--
作者:
Miura, T;Kiyota, K;Iwasawa, N

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[图表]在光辐射下,用催化量的W(CO)(6)处理5-己基-1,2,5-三烯,进行正式科普重排,以良好的产率得到2-slooxyhex-1-en-5-ynes。由W(CO)5的联烯基部分的亲电活化引发的硅烷基烯醇醚在6-endo方式的分子内攻击,以产生环己烯基钨物种。碳-碳键断裂通过阴离子W(CO)(5)向硅氧鎓部分提供电子而发生,W(CO)(6)(L)再生得到产物。
[GRAPHICS]On treatment of 5-siloxyhexa-1,2,5-trienes with a catalytic amount of W(CO)(6) under photoirradiation, formal Cope rearrangement proceeded to give 2-slioxyhex-1-en-5-ynes in good yield. The electrophilic activation of the allenyl moiety by W(CO)5 triggers the intramolecular attack of the silyl enol ether in a 6-endo manner to produce a cyclohexenyl tungsten species. Carbon-carbon bond cleavage occurs by electron donation from the anionic W(CO)(5) into the silyloxonium moiety to afford the products with regeneration of the W(CO)(6)(L).