Asymmetric synthesis of α-allyl-α-aryl α-amino acids by tandem alkylation/π-allylation of α-iminoesters.

Asymmetric synthesis of α-allyl-α-aryl α-amino acids by tandem alkylation/π-allylation of α-iminoesters.
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DOI:
10.1021/ol500506t
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发表时间:
2014-04-04
期刊:
影响因子:
5.2
通讯作者:
Kozlowski, Marisa C.
Kozlowski, Marisa C.
中科院分区:
化学1区
文献类型:
--
作者:
Curto, John M.;Dickstein, Joshua S.;Berritt, Simon;Kozlowski, Marisa C.

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The first asymmetric synthesis of α-allyl-α-aryl α-amino acids by means of a three-component coupling of α-iminoesters, Grignard reagents, and cinnamyl acetate is reported. Notably, the enolate from the tandem process provides a much higher level of reactivity and selectivity than the same enolate generated via direct deprotonation, presumably due to differences in the solvation/aggregation state. A novel method for removal of a homoallylic amine protecting group delivers the free amine congeners. The α-allyl group offers a means to generate further valuable α-amino acid structures as exemplified by ring closing metathesis to generate a higher ring homologue of α-aryl-proline.
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