Asymmetric, organocatalytic, three-step synthesis of alpha-hydroxy-(E)-beta,gamma-unsaturated esters.

Asymmetric, organocatalytic, three-step synthesis of alpha-hydroxy-(E)-beta,gamma-unsaturated esters.
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DOI:
10.1021/ol100615j
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发表时间:
2010-05-07
期刊:
影响因子:
5.2
通讯作者:
Posner GH
Posner GH
中科院分区:
化学1区
文献类型:
--
作者:
Hess LC;Posner GH

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报道了一种高效的、对映体控制的α-羟基-(E)-β,γ-不饱和酯的三步合成方法。通过醛的不对称有机催化α-硒化反应一步合成了对映体富集的α-硒基醛,直接进行Wittig反应,然后烯丙基硒醚氧化为硒氧化物,最后进行自发的[2,3]-σ迁移重排,以43- 65%的总收率和94- 97%的ee得到目标化合物。
An efficient and enantiocontrolled 3-step synthesis of α-hydroxy-(E)-β,γ-unsaturated esters is reported. Enantioenriched α-selenyl aldehydes, prepared in one step by asymmetric, organocatalytic α-selenylation of aldehydes, were directly subjected to a Wittig reaction followed by allylic selenide to selenoxide oxidation and final spontaneous [2,3]-sigmatropic rearrangement to yield the target compounds in 43–65 % overall yield and in 94–97 % ee.
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