Synlett 2023; 34(12): 1502-1506
DOI: 10.1055/a-1979-6245
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Special Issue Honoring Masahiro Murakami’s Contributions to Science

Two-Step Substitution Reaction of Phosphonates Carrying a Binaphthyl Group with Grignard Reagents Leading to the Formation of P-Chirogenic Phosphine Oxides

Shunya Ono
a   Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
,
Aya Sugiyama
a   Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
,
Nao Sakamoto
a   Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
,
Kazuma Kuwabara
a   Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
,
Mao Minoura
b   Department of Chemistry, Graduate School of Science, Rikkyo University, Nishi-ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
,
Toshiaki Murai
a   Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
› Author Affiliations

This research was partly supported by a Grant-in-Aid for Scientific Research (C) (22K05109) and (B) (19H02712) from MEXT.


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This paper is dedicated to Professor Masahiro Murakami for his contribution to science.

Abstract

The reaction of phosphonates carrying a binaphthyl group with a range of Grignard reagents was complete within two hours at 0 °C to give phosphinates carrying a hydroxybinaphthyl group with high ­efficiency and diastereoselectivity. The resulting phosphinates were further subjected to a substitution reaction with MeMgBr. The reaction at reflux temperature in THF or toluene permitted the formation of P-chirogenic tertiary phosphine oxides with a high enantiomeric ratio. Rare examples of P-chirogenic alkynyl phosphine oxides were also obtained. The sequential one-pot substitution reaction of phosphonates bearing a binaphthyl group with two different Grignard reagents successfully gave the corresponding P-chirogenic phosphine oxides with enantiomeric ratios nearly equal to those of oxides derived from two-step reactions.

Supporting Information



Publication History

Received: 25 October 2022

Accepted: 15 November 2022

Accepted Manuscript online:
15 November 2022

Article published online:
01 December 2022

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