Catalyst-controlled doubly enantioconvergent coupling of racemic alkyl nucleophiles and electrophiles.

Catalyst-controlled doubly enantioconvergent coupling of racemic alkyl nucleophiles and electrophiles.
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催化剂控制的外消旋烷基亲核试剂和亲电子试剂的双对映会聚偶联。

DOI:
10.1126/science.aaz3855
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发表时间:
2020-01-31
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Fu GC
Fu GC
中科院分区:
其他
文献类型:
--
作者:
Huo H;Gorsline BJ;Fu GC

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碳-碳键的构建和产物立体化学的控制是有机合成中两个最重要的挑战。烷基亲电试剂被烷基亲核试剂的取代反应是有机合成的潜在强大的收敛策略;然而,在实践中,取代反应的经典机制(SN 1和SN 2途径)在它们产生碳-碳键和控制产物立体化学的能力方面受到限制,当从容易获得的外消旋起始材料开始时。我们已经开发了一种手性镍催化剂,其首次将外消旋亲电体与外消旋亲核体偶联以在双立体会聚过程中形成碳-碳键(即,由起始原料的两种立体化学混合物得到产物的单一立体异构体)。镍催化偶联两个外消旋伙伴,形成一个新的碳-碳键作为一个单一的立体异构体。
The construction of carbon–carbon bonds and the control of product stereochemistry are two of the most important challenges in organic synthesis. The substitution reaction of an alkyl electrophile by an alkyl nucleophile is a potentially powerful, convergent strategy for organic synthesis; however, in practice, classical mechanisms for substitution reactions (SN1 and SN2 pathways) are limited in their ability to generate carbon–carbon bonds and to control product stereochemistry when beginning with readily available racemic starting materials. We have developed a chiral nickel catalyst that couples, for the first time, racemic electrophiles with racemic nucleophiles to form carbon–carbon bonds in doubly stereoconvergent processes (i.e., affording a single stereoisomer of the product from two stereochemical mixtures of starting materials). The nickel-catalyzed coupling of two racemic partners to form a new carbon–carbon bond as a single stereoisomer is described.
DOI: 10.1126/science.aaf7230
发表时间: 2017-04-14
期刊: Science (New York, N.Y.)
影响因子: --
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通讯作者: Fu GC
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