Silicon in Synthesis. 10. The (Trimethylsilyl)allyl Anion: A .beta.-Acyl Anion Equivalent for the Conversion of Aldehydes and Ketones into .gamma.-Lactones
Preparation of γ-trimethylsilylallyldibutylstannane grafted on solid support: a clean and easily recyclable reagent for the synthesis of 2,6-disubstituted dihydropyrans
annane grafted on an insoluble macroporous polymer is reported. This bimetallic reagent was treated with aldehydes in the presence of indium trichloride to afford in good yields both symmetrical and unsymmetrical cis-2,6-disubstituted dihydropyrans, practically uncontaminated with organotin residues (less than 20 ppm). The potential for regeneration and reuse of this supported bimetallic reagent is
Preparation of oxetanes by silicon-directed 4-exo trig electrophilic cyclisations of homoallylic alcohols
作者:Mazin Rofoo、Marie-Claude Roux、Gérard Rousseau
DOI:10.1016/s0040-4039(01)00227-1
日期:2001.3
The reaction of homoallylic alcohols with bis(sym-collidine)bromine(I) hexafluoroantimonate led in good yields to the formation of oxetanes if a silyl group was fixed on the carbon-carbon double bond in terminal position. This reaction was stereospecific when no supplementary substituent was present on the double bond. (C) 2001 Elsevier Science Ltd. All rights reserved.
EHLINGER E.; MAGNUS P., J. AMER. CHEM. SOC., 1980, 102, NO 15, 5004-5011