Palladium and platinum catalyzed addition of allylstannanes to aldehydes and imines
Conference
·
OSTI ID:250091
- Kyushu Univ., Fukoka (Japan)
- Tohoku Univ., Sendai (Japan)
The reaction of allylstannanes with aldehydes in THF was catalyzed by Pd(II) or Pt(II) complexes (10 mole %) either at room temperature or at reflux, giving the corresponding homoallyl alcohols in high to good yields. Among the catalysts examined, PtCl{sub 2}(PPh{sub 3}){sub 2} gave the best result. Aromatic, aliphatic, and {alpha},{beta}-unsaturated aldehydes can be utilized and even cyclohexanone undergoes the allylation reaction. Allyl and methallyltributylstannane reacted very smoothly. Crotyltributylstannane also reacted with aldehydes to give the branched homoallyl alcohols in good yields, but the reaction speed was slower than that of allylstannane. Detailed mechanistic studies of the Pd(II) catalyzed allylation, using NMR spectra, revealed that bis-{pi}-allyl palladium 5 is a key intermediate for the catalytic cycle and it exhibits nucleophilic reactivity.
- OSTI ID:
- 250091
- Report Number(s):
- CONF-9508100--
- Country of Publication:
- United States
- Language:
- English
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