Ring Opening of 3‐Bromo‐2‐Isoxazolines to β‐Hydroxy Nitriles
作者:Martin G. Kociolek、Kyle P. Kalbarczyk
DOI:10.1081/scc-200039452
日期:2004.12.31
3-Bromo-2-isoxazolines were converted to the corresponding beta-hydroxy nitriles by treatment with sodium iodide in the presence of either chlorotrimethylsilane or para-toluenesulfonic acid. Both methods gave beta-hydroxy nitriles under relatively mild conditions in good to moderate yields for a variety of substituted 3-bromo-2-isoxazolines.
Selective reduction of aldehydes and ketones to alcohols with ammonia borane in neat water
Chemoselectivereduction of various carbonyl compounds to alcohols with ammonia borane (AB), a nontoxic, environmentally benign, and easily handled reagent, in neat water was achieved in quantitative conversions and high isolated yields. Interestingly, α- and β-keto esters were selectively reduced to corresponding hydroxyl esters by AB, while diols were obtained when sodiumborohydride was used as