Asymmetric hydrovinylation of 1-vinylcycloalkenes. Reagent control of regio- and stereoselectivity.

Asymmetric hydrovinylation of 1-vinylcycloalkenes. Reagent control of regio- and stereoselectivity.
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DOI:
10.1021/ja301640e
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发表时间:
2012-04-18
影响因子:
15
通讯作者:
RajanBabu, T. V.
RajanBabu, T. V.
中科院分区:
化学1区
文献类型:
--
作者:
Page, Jordan P.;RajanBabu, T. V.

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1-乙烯基环烯烃在[(S,S)-2,4-双-二苯基膦基戊烷(BDPP)] CoCl 2(0.05当量)存在下,用乙烯(1个大气压)在室温下处理时发生高度区域选择性和对映选择性(> 98%ee)的1,4-加氢乙烯基化(HV)。和甲基铝氧烷。仅在1-乙烯基环己烯(~15%)和1-乙烯基环庚烯(2%)中观察到少量1,2-HV产物,形成外消旋混合物。相应的Ni(II)催化的HV反应,这些基板主要得到的1,2-加合物。外消旋4-叔丁基-1-乙烯基环己烯用Co[(S,S)-(BDPP)] Cl 2和乙烯处理时,发生罕见的对映体发散反应,得到两种非对映体,每一种的ee>98%.
1-Vinylcycloalkenes undergo highly regio- and enantioselective (>98% ee) 1,4-hydrovinylation (HV) when treated with ethylene (1 atmosphere) at room temperature in the presence of [(S,S)-2,4-bis-diphenylphosphinopentane (BDPP)]CoCl2 (0.05 equiv.) and methylaluminoxane. The minor 1,2-HV products, seen only in 1-vinylcyclohexene (~15%) and 1-vinylcycloheptene (2%), are formed as racemic mixtures. The corresponding Ni(II)-catalyzed HV reactions of these substrates give mostly the 1,2-adducts. Racemic 4-t- butyl-1-vinylcyclohexene, when treated with Co[(S,S)-(BDPP)]Cl2 and ethylene undergoes a rare enantiodivergent reaction giving two diastereomers each in >98% ee.
为了追求理想的C-C形成反应:烯烃的氢化烯化的发展和应用。
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