1
The invention provides compounds of formula (I), wherein A, B and R are as defined in the description, and the preparation thereof. The compounds of formula (I) are useful as somatostatin receptor antagonists.
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