Direct, redox-neutral prenylation and geranylation of secondary carbinol C-H bonds: C4-regioselectivity in ruthenium-catalyzed C-C couplings of dienes to α-hydroxy esters.

Direct, redox-neutral prenylation and geranylation of secondary carbinol C-H bonds: C4-regioselectivity in ruthenium-catalyzed C-C couplings of dienes to α-hydroxy esters.
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DOI:
10.1021/ja3075049
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发表时间:
2012-09-26
影响因子:
15
通讯作者:
Krische, Michael J.
Krische, Michael J.
中科院分区:
化学1区
文献类型:
--
作者:
Leung, Joyce C.;Geary, Laina M.;Chen, Te-Yu;Zbieg, Jason R.;Krische, Michael J.

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由Ru 3(CO)12和三环己基膦(PCy 3)原位生成的钌催化剂促进芳基取代的α-羟基酯与异戊二烯和月桂烯在二烯C4-位的氧化还原中性C-C偶联,分别导致直接的甲醇C-H异戊二烯化和香叶基化。该方法能够在不存在化学计量副产物或预金属化试剂的情况下将仲醇直接转化为叔醇,并且是2-取代二烯与羰基配偶体的催化C-C偶联中的C4-区域选择性的第一个实例。机理研究证实了一个催化循环,涉及二烯-羰基氧化偶联。
The ruthenium catalyst generated in situ from Ru3(CO)12 and tricyclohexylphosphine, PCy3, promotes the redox-neutral C-C coupling of aryl substituted α-hydroxy esters to isoprene and myrcene at the diene C4-position, resulting in direct carbinol C-H prenylation and geranylation, respectively. This process enables direct conversion of secondary to tertiary alcohols in the absence of stoichiometric byproducts or premetallated reagents, and is the first example of C4-regioselectivity in catalytic C-C couplings of 2-substituted dienes to carbonyl partners. Mechanistic studies corroborate a catalytic cycle involving diene-carbonyl oxidative coupling.
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