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.
Pseudoephedrine as a Practical Chiral Auxiliary for the Synthesis of Highly Enantiomerically Enriched Carboxylic Acids, Alcohols, Aldehydes, and Ketones
作者:Andrew G. Myers、Bryant H. Yang、Hou Chen、Lydia McKinstry、David J. Kopecky、James L. Gleason
DOI:10.1021/ja970402f
日期:1997.7.1
pseudoephedrine as a practical chiral auxiliary for asymmetricsynthesis is described in full. Both enantiomers of pseudoephedrine are inexpensive commodity chemicals and can be N-acylated in high yields to form tertiary amides. In the presence of lithium chloride, the enolates of the corresponding pseudoephedrine amides undergo highly diastereoselective alkylations with a wide range of alkyl halides to