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
Lumb, Jean-Philip
中科院分区:
化学1区
文献类型:
--
作者:
Trost, Barry M.;Taft, Benjamin R.;Masters, James T.;Lumb, Jean-Philip

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报道了一种新的手性β-炔基酯的合成方法,即采用钯铜连续催化法。可以使用带有芳基、烷基和甲硅烷基的末端炔,而无需预先活化,从而产生宽范围的重要手性结构单元。该反应顺序利用了一个强大的Pd(II)催化的加氢炔基化炔酸酯与末端炔提供几何纯炔酸酯,很容易被还原的CuH。与先前的报道相反,其中炔酸酯的加成以对1,6-途径的边际偏好进行,这种缀合物还原以高的1,4-选择性发生,产生具有优异水平的对映选择性的β-炔基酯。重要的是,该方法容许宽范围的官能团,包括烯丙基碳酸酯和氨基甲酸酯,因此允许将β-炔基酯快速加工成各种手性取代的杂环。
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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