Type II Intramolecular [5+2] Cycloaddition: Facile Synthesis of Highly Functionalized Bridged Ring Systems

被引:77
|
作者
Mei, Guangjian [2 ]
Liu, Xin [1 ]
Qiao, Chuang [2 ]
Chen, Wei [2 ]
Li, Chuang-chuang [1 ,2 ]
机构
[1] South Univ Sci & Technol China, Dept Chem, Shenzhen 518055, Peoples R China
[2] Peking Univ, Shenzhen Grad Sch, Sch Chem Biol & Biotechnol, Lab Chem Genom, Shenzhen 518055, Peoples R China
关键词
bridged ring systems; cycloaddition; diastereoselectivity; endo selectivity; natural products; DIELS-ALDER REACTION; TUMOR PROMOTERS; CYCLO-ADDITIONS; VINYLCYCLOPROPANES; METAL; 1ST; CYCLOISOMERIZATION; WELWITINDOLINONES; CYCLOCITRINOL; ALKALOIDS;
D O I
10.1002/anie.201410806
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A typeII intramolecular oxidopyrylium-mediated [5+2] cycloaddition reaction allows the efficient and diastereoselective formation of various highly functionalized and synthetically challenging bridged seven-membered ring systems (such as bicyclo[4.4.1]undecane, bicyclo[4.3.1]decane, bicyclo[5.4.1]dodecane, and bicyclo[6.4.1]]tridecane). This simple, thermal, direct transformation has a broad substrate scope and is high yielding, with high functional-group tolerance and unique endo selectivity. The highly strained tricyclic cores of ingenol mebutate (picato) and cyclocitrinol are synthesized efficiently and diastereoselectively using this methodology.
引用
收藏
页码:1754 / 1758
页数:5
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