Origins of regioselectivity and alkene-directing effects in nickel-catalyzed reductive couplings of alkynes and aldehydes.

Origins of regioselectivity and alkene-directing effects in nickel-catalyzed reductive couplings of alkynes and aldehydes.
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DOI:
10.1021/ja909562y
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发表时间:
2010-02-17
影响因子:
15
通讯作者:
Houk, K. N.
Houk, K. N.
中科院分区:
化学1区
文献类型:
--
作者:
Liu, Peng;McCarren, Patrick;Cheong, Paul Ha-Yeon;Jamison, Timothy F.;Houk, K. N.

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采用密度泛函方法研究了镍催化还原偶联反应中区域选择性和烯烃导向效应的来源。简单炔的区域选择性受空间效应控制,而共轭烯炔和二炔预计具有增加的反应性和非常高的区域选择性,将烯基或炔基置于形成的C-C键的远端。烯炔和二炔的反应涉及对共轭烯炔或二炔上的Ni-羰基络合物的共轭烯炔的1,4-攻击。
Origins of regioselectivity and alkene-directing effects in nickel-catalyzed reductive coupling reactions were investigated by density functional calculations. Regioselectivity of simple alkynes is controlled by steric effects, while conjugated enynes and diynes are predicted to have increased reactivity and very high regioselectivities, placing alkenyl or alkynyl groups distal to the forming C–C bond. The reactions of enynes and diynes involve 1,4-attack on the conjugated enyne of the Ni-carbonyl complex on the conjugated enyne or diyne.
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