Synthesis and reactions of optically active phosphine-boranes

✍ Scribed by Tsuneo Imamoto; Toshiyuki Oshiki; Takashi Onozawa; Masatoshi Matsuo; Takaaki Hikosaka; Masao Yanagawa

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 1022 KB
• Volume: 3
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.520030519

✦ Synopsis

Synthesis and reactions of optically active phosphine-boranes have been investigated. Optically active secondary phosphine-boranes, (Sp)-and (Rp)-menthyloxyphenylphosphine-boranes,

and (S)-methylphenylphosphine-borane underwent palladium(0)-catalyzed electrophilic arylation with 0-, 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,)-menthyloxy (methy1)phenylphosphine-borane and &)-menthyloxy(o-methoxypheny1)phenylphosphine-borane was reductively cleaved at -78°C by lithium naphthalenide or Li/NH, 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.

Phosphine-boranes, adducts of phosphines with boranes, constitute a unique class of organophosphorus compounds because of their unique chemical properties. The properties of phosphine-boranes have attracted the attention of many chemists, Dedicated to Prof. Yao-Zeng Huang on the occasion of his *To whom correspondence should be addressed. eightieth birthday.