Chemoselective Removal of Allylic Formyloxy Group Using Sml2
摘要:
A variety of allylic formates are chemoselectively transformed into the corresponding olefins in excellent yields on treatment with Sml2 in THF-HMPA-H2O (20:5:1), even though allylic acetate and allylic ether groups are present in the same molecule.
Highly regio- and stereoselective reductions of carbonyl compounds in aqueous glycosidic media
作者:Cécile Denis、Benoît Laignel、Daniel Plusquellec、Jean-Yves Le Marouille、Alain Botrel
DOI:10.1016/0040-4039(95)02094-2
日期:1996.1
Highly regioselective reductions of α,β-unsaturated ketones to the corresponding allylic alcohols were performed in essentially quantitative yields in aqueous media containing either glycosidic surfactants or amphiphilic carbohydrates. Reductions of cyclohexanones and cyclohexenones lead under the same conditions, stereoselectively to reduced compounds bearing an equatorial alcohol function. Hydrophobic
Silica gel-supported zinc borohydride. 2. Regioselective 1,2-reduction of conjugated ketones and aldehydes to the corresponding allylic alcohols
作者:Brindaban C. Ranu、Asish R. Das
DOI:10.1021/jo00015a042
日期:1991.7
Lanthanoids in organic synthesis. 6. Reduction of .alpha.-enones by sodium borohydride in the presence of lanthanoid chlorides: synthetic and mechanistic aspects
作者:Andre L. Gemal、Jean Louis Luche
DOI:10.1021/ja00408a029
日期:1981.9
Aminoborohydrides. 4. The Synthesis and Characterization of Lithium Aminoborohydrides: A New Class of Powerful, Selective, Air-Stable Reducing Agents
作者:Gary B. Fisher、Joseph C. Fuller、John Harrison、Salvador G. Alvarez、Elizabeth R. Burkhardt、Christian T. Goralski、Bakthan Singaram
DOI:10.1021/jo00100a046
日期:1994.10
Lithium aminoborohydrides (LiABH(3)) are a new class of powerful yet selective reducing agents that reproduce, in air, virtually all of the transformations for which lithium aluminum hydride is now used. LiABH(3)'s can be readily prepared as solids or generated in situ, are nonpyrophoric, and liberate hydrogen only slowly with protic solvents above pH 4. LiABH(3)'s can be handled in dry air as easily as sodium borohydride and retain their chemical activity for at least 6 months when stored under nitrogen or dry air at 25 degrees C. LiABH(3)'s can be synthesized from any primary or secondary amine, thus allowing control of the steric and electronic environment of these reagents.
A Simple, Efficient, and Selective Method for Tetrahydropyranylation of Alcohols on a Solid Phase of Alumina Impregnated with Zinc Chloride