Asymmetric Synthesis of Protected Unnatural α-Amino Acids via Enantioconvergent Nickel-Catalyzed Cross-Coupling.

Asymmetric Synthesis of Protected Unnatural α-Amino Acids via Enantioconvergent Nickel-Catalyzed Cross-Coupling.
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DOI:
10.1021/jacs.1c03903
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发表时间:
2021-06-16
影响因子:
15
通讯作者:
Fu GC
Fu GC
中科院分区:
化学1区
文献类型:
--
作者:
Yang ZP;Freas DJ;Fu GC

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近年来,从蛋白质设计到药物化学再到材料科学,对非天然α-氨基酸的兴趣迅速增加。因此,开发高效、通用、直接的方法来进行它们的对映选择性合成是反应开发中的一个重要目标。在这份报告中,我们建立了一个手性催化剂的基础上,镍,地球丰富的金属,可以实现对映体收敛耦合的外消旋烷基亲电试剂与各种各样的烷基锌试剂(1:1.1的比例),以提供良好的收率和ee保护的非天然α-氨基酸。这种交叉偶联,在温和的条件下进行,是宽容的空气,水分,和广泛的功能基团,补充了早期的方法,催化不对称合成这个有价值的家庭的分子。我们已经将我们的新方法应用于生成几种对映体富集的非天然α-氨基酸,这些氨基酸以前已被证明是合成生物活性化合物中有用的中间体。
Interest in unnatural α-amino acids has increased rapidly in recent years in areas ranging from protein design to medicinal chemistry to materials science. Consequently, the development of efficient, versatile, and straightforward methods for their enantioselective synthesis is an important objective in reaction development. In this report, we establish that a chiral catalyst based on nickel, an earth-abundant metal, can achieve the enantioconvergent coupling of readily available racemic alkyl electrophiles with a wide variety of alkylzinc reagents (1:1.1 ratio) to afford protected unnatural α-amino acids in good yield and ee. This cross-coupling, which proceeds under mild conditions and is tolerant of air, moisture, and a broad array of functional groups, complements earlier approaches to the catalytic asymmetric synthesis of this valuable family of molecules. We have applied our new method to the generation of several enantioenriched unnatural α-amino acids that have previously been shown to serve as useful intermediates in the synthesis of bioactive compounds.
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