N-heterocyclic carbene-catalyzed conjugate additions of alcohols.
N-heterocyclic carbene-catalyzed conjugate additions of alcohols.
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DOI:
10.1021/ja1061196
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发表时间:
2010-09-29
影响因子:
15
通讯作者:
Scheidt, Karl A.
中科院分区:
文献类型:
--
作者:
Phillips, Eric M.;Riedrich, Matthias;Scheidt, Karl A.
An efficient intermolecular conjugate addition of alcohols to activated alkenes catalyzed by N-heterocyclic carbenes has been developed. With 5 mol % of the free carbene derived from IMes•HCl, unsaturated ketones and esters are competent substrates and a variety of primary and secondary alcohols can be employed as the nucleophile. No oligomerization is observed under these mild conditions for effective hydroalkoxylation. In addition to reactions with activated alkenes, IMes catalyzes the formation of vinyl ethers through the 1,4-addition of alcohols to ynones and promotes tandem conjugate addition/Michael cascade reactions. Preliminary data supports a Brønsted base mechanism with the free carbene.
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