Enantioselective reduction of meso-cyclic-1,2-dicarboxylic anhydrides and 1,2-dicarboximides: Asymmetric synthesis of bicyclic lactones and hydroxylactams

DOI: 10.1248/cpb.42.9

Source and publish data:

Chemical and Pharmaceutical Bulletin p. 9 - 18 (1994)

Update date:2022-08-05

Topics:

Authors:

Matsuki Matsuki

Inoue Inoue

Ishida Ishida

Takeda Takeda

Nakagawa

Hino Hino

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Article abstract of DOI:10.1248/cpb.42.9

Chiral bicyclic lactones (3,8,9) and bicyclic hydroxylactams (10-13) were synthesized by highly enantioselective reduction of meso-cyclic-1,2- dicarboxylic anhydrides (1, 4) and meso-cyclic-1,2-dicarboximides (2) with lithium aluminum hydride (LiAlH₄)-alcohol(ROH)-(R)- or (S)-1,1'-bi-2- naphthol complex [(R)- or (S)-BINAL-H(ROH)]. Treatment of the hydroxylactams (10-13) with triethylsilane (Et₃SiH) and trifluoroacetic acid (CF₃CO₂H) gave chiral bicyclic lactams (14, 15) in quantitative yields. Removal of the N-4-methoxyphenyl group of the lactams (14, 15) with cerium(IV) ammonium nitrate (CAN) proceeded smoothly to give the corresponding N-unsubstituted lactams (16, 17) in high optical purity.

Full text of DOI:10.1248/cpb.42.9

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