Use of Pseudoephedrine as a Practical Chiral Auxiliary for Asymmetric Synthesis
作者:Andrew G. Myers、Bryant H. Yang、Hou Chen、James L. Gleason
DOI:10.1021/ja00099a076
日期:1994.10
form tertiaryamides. In the presence of lithium chloride, the enolates of the corresponding pseudoephedrine amides undergo highly diastereoselective a1kylations with a wide range of alkyl halides to afford α-substituted products in high yields. These products can then be transformed in a single operation into highly enantiomerically enriched carboxylic acids, alcohols, and aldehydes. Lithium amidotrihydroborate
Lithium amidotrihydroborate, a powerful new reductant. Transformation of tertiary amides to primary alcohols
作者:Andrew G. Myers、Bryant H. Yang、Kopecky J. David
DOI:10.1016/0040-4039(96)00652-1
日期:1996.5
Lithiumamidotrihydroborate (LiH2NBH3, LAB) is a new and highly nucleophilic reducing agent that is easily prepared by deprotonation of the commerical reagent borane-ammonia complex (H3NBH3) with n-BuLi in tetrahydrofuran (THF) at 0 °C. LAB is found to be a superior reagent for the transformation of tertiaryamides into the corresponding primaryalcohols.
Palladium-Catalyzed Suzuki−Miyaura Cross-Coupling Reactions of Enantiomerically Enriched Potassium β-Trifluoroboratoamides with Various Aryl- and Hetaryl Chlorides
作者:Gary A. Molander、Inji Shin、Ludivine Jean-Gérard
DOI:10.1021/ol101865e
日期:2010.10.1
Enantiomerically enriched potassium β-trifluoroboratoamides were synthesized as air-stable solids in greater than 95:5 dr using pseudoephedrine as the chiral auxiliary. With these chiral nucleophiles, Suzuki−Miyaura cross-coupling reactions were carried out with various aryl- and hetaryl chlorides in good to excellent yields. Moreover, the diastereoselectivities were preserved throughout the Suzuki−Miyaura