A new strategy for the synthesis of chiral β-alkynyl esters via sequential palladium and copper catalysis.
A new strategy for the synthesis of chiral β-alkynyl esters via sequential palladium and copper catalysis.
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DOI:
10.1021/ja203171x
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发表时间:
2011-06-08
影响因子:
15
通讯作者:
Lumb, Jean-Philip
中科院分区:
文献类型:
--
作者:
Trost, Barry M.;Taft, Benjamin R.;Masters, James T.;Lumb, Jean-Philip
A new strategy for the synthesis of chiral β-alkynyl esters which relies on sequential Pd and Cu catalysis is reported. Terminal alkynes bearing aryl-, alkyl-, and silyl-groups can be employed without prior activation yielding a wide range of important chiral building blocks. The reaction sequence utilizes a robust Pd(II)-catalyzed hydroalkynylation of ynoates with terminal alkynes providing geometrically-pure ynenoates which are readily reduced by CuH. In contrast to previous reports, where additions to ynenoates proceed with marginal preference for the 1,6-pathway, this conjugate reduction occurs with high 1,4-selectivity yielding β-alkynyl esters with excellent levels of enantioselectivity. Importantly, the method tolerates a wide range of functionality, including allylic carbonates and carbamates, and thus allows for rapid elaboration of the β-alkynyl esters into a variety of chiral, substituted heterocycles.
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