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Continuous Flow Preparation of Benzylic Sodium Organometallics.

ABSTRACT: We report a lateral sodiation of alkyl(hetero)arenes using on-demand generated hexane-soluble (2-ethylhexyl)sodium (1) in the presence of TMEDA. (2-Ethylhexyl)sodium (1) is prepared via a sodium packed-bed reactor and used for metalations at ambient temperature in batch as well as in continuous flow. The resulting benzylic sodium species are subsequently trapped with various electrophiles including carbonyl compounds, epoxides, oxetane, allyl/benzyl chlorides, alkyl halides and alkyl tosylates. Wurtz-type couplings with secondary alkyl halides and tosylates proceed under complete inversion of stereochemistry. Furthermore, the utility of this lateral sodiation is demonstrated in the synthesis of pharmaceutical relevant compounds. Thus, fingolimod is prepared from p-xylene applying the lateral sodiation twice. In addition, 7-fold isotopically labeled salmeterol-d₇ and fenpiprane as well as precursors to super linear alkylbenzene (SLAB) surfactants are prepared.

SUBMITTER: Harenberg JH

PROVIDER: S-EPMC9400861 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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Continuous Flow Preparation of Benzylic Sodium Organometallics.

Harenberg Johannes H JH Reddy Annapureddy Rajasekar R Karaghiosoff Konstantin K Knochel Paul P

Angewandte Chemie (International ed. in English) 20220511 30

We report a lateral sodiation of alkyl(hetero)arenes using on-demand generated hexane-soluble (2-ethylhexyl)sodium (1) in the presence of TMEDA. (2-Ethylhexyl)sodium (1) is prepared via a sodium packed-bed reactor and used for metalations at ambient temperature in batch as well as in continuous flow. The resulting benzylic sodium species are subsequently trapped with various electrophiles including carbonyl compounds, epoxides, oxetane, allyl/benzyl chlorides, alkyl halides and alkyl tosylates. ...[more]

PMID: 35416397

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