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Enantioselective ?-Benzylation of Acyclic Esters Using ?-Extended Electrophiles.

ABSTRACT: The first asymmetric cooperative Lewis base/palladium catalyzed benzylic alkylation of acyclic esters is reported. This reaction proceeds via stereodefined C1-ammonium enolate nucleophiles. Critical to its success was the identification of benzylic phosphate electrophiles, which were uniquely reactive. Alkylated products were obtained with very high levels of enantioselectivity, and this method has been applied toward the synthesis of the thrombin inhibitor DX-9065a.

SUBMITTER: Schwarz KJ

PROVIDER: S-EPMC6499373 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Enantioselective α-Benzylation of Acyclic Esters Using π-Extended Electrophiles.

Schwarz Kevin J KJ Yang Chao C Fyfe James W B JWB Snaddon Thomas N TN

Angewandte Chemie (International ed. in English) 20180820 37

The first asymmetric cooperative Lewis base/palladium catalyzed benzylic alkylation of acyclic esters is reported. This reaction proceeds via stereodefined C1-ammonium enolate nucleophiles. Critical to its success was the identification of benzylic phosphate electrophiles, which were uniquely reactive. Alkylated products were obtained with very high levels of enantioselectivity, and this method has been applied toward the synthesis of the thrombin inhibitor DX-9065a. ...[more]

PMID: 30011353

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