Cyclization/hydrosilylation of functionalized dienes catalyzed by a cationic palladium phenanthroline complex

被引:49
作者
Widenhoefer, RA [1 ]
Stengone, CN [1 ]
机构
[1] Duke Univ, Paul M Gross Chem Lab, Durham, NC 27708 USA
关键词
D O I
10.1021/jo9913006
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Mixtures of(phen)PdMe2 (2a) and HBAr'(4) (3a) or (phen)PdMe(Cl) (2b) and NaBAr'(4) (3b) [phen = 1, 10-phenanthroline; Ar' = 3,5-C6H3(CF3)(2)] catalyzed the cyclization/hydrosilylation of functionalized 1,6-dienes to form silylated cyclopentanes in good yield and with excellent trans selectivity about the newly formed C-C bond (typically >50:1). A range of tertiary hydrosilanes were employed in the procedure although unhindered trialkylsilanes provided the most consistent results. The protocol tolerated a range of polar functionality including esters, ethers, amides, sulfones, and cyano groups. 4,4-Disubstitution on the diene backbone promoted cyclization, and a homoallylic ester, ketone, or ether directing group was required for efficient cyclization. The procedure tolerated dienes which possessed a single trans-substituted olefin and also tolerated allylic substitution. These substituted dienes underwent cyclization/hydrosilylation to form carbocycles resulting from transfer of the silyl group to the less hindered olefin. Mixtures of 2a and 3a also catalyzed the cyclization/hydrosilylation of functionalized 1,7-dienes to form silylated cyclohexane derivatives. Cyclization/hydrosilylation of 1,7-dienes was typically slower, less stereoselective, and more sensitive to substitution than was cyclization of 1,6-dienes.
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页码:8681 / 8692
页数:12
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