Coupling of sterically hindered trisubstituted olefins and benzocyclobutenones by C-C activation: total synthesis and structural revision of cycloinumakiol.
Coupling of sterically hindered trisubstituted olefins and benzocyclobutenones by C-C activation: total synthesis and structural revision of cycloinumakiol.
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DOI:
10.1002/anie.201404802
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发表时间:
2014-09-26
影响因子:
16.6
通讯作者:
Dong, Guangbin
中科院分区:
文献类型:
--
作者:
Xu, Tao;Dong, Guangbin
The first total synthesis of the proposed structure of cycloinumakiol (1) and its C5-epimer (18) are achieved in a concise and efficient fashion: 9 and 5 steps from known 3-hydroxybenzocyclobutenone with overall yields of 15% and 33%, respectively. A key for the success of this approach is use of a catalytic C–C activation strategy for constructing the tetracyclic core of 1 through carboacylation of a sterically hindered trisubstituted olefin with benzocyclobutenone. In addition, the structure of the natural cycloinumakiol was reassigned to 19-hydroxyltotarol (7) through X-ray diffraction analysis. This work demonstrates the potential of C–C activation for streamlining complex natural-product synthesis.
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