1992年10月
SYNTHESIS AND REACTIONS OF OPTICALLY-ACTIVE PHOSPHINE-BORANES
HETEROATOM CHEMISTRY
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- 巻
- 3
- 号
- 5-6
- 開始ページ
- 563
- 終了ページ
- 575
- 記述言語
- 英語
- 掲載種別
- 出版者・発行元
- JOHN WILEY & SONS INC
Synthesis and reactions of optically active phosphine-boranes have been investigated. Optically active secondary phosphine-boranes, (S(p))-and (R(p))-menthyloxyphenylphosphine-boranes, and (S)-methylphenylphosphine-borane underwent palladium(0)-catalyzed electrophilic arylation with o-, m-, or p-iodoanisole. The stereochemistry of this arylation was largely dependent on the solvent and the base used. The reaction in acetonitrile proceeded with almost complete retention of configuration at the chiral phosphorus, whereas inversion of configuration was observed in ethereal solvents or toluene. The phosphorus-oxygen bond of (R(p))-menthyloxy (methyl)phenylphosphine-borane and (S(p))-menthy-loxy(o-methoxyphenyl)phenylphosphine-borane was reductively cleaved at -78-degrees-C by lithium naphthalenide or Li/NH3 with virtually net retention of configuration at phosphorus, providing secondary or tertiary phosphine-boranes in excellent yields. New synthetic routes to optically pure C2-symmetric bisphosphine-boranes possessing chirality at phosphorus have been developed on the basis of these stereochemical studies.
- リンク情報
- ID情報
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- ISSN : 1042-7163
- Web of Science ID : WOS:A1992KL80300018