Enantioselective Addition of Activated Terminal Alkynes to 1-Acylpyridinium Salts Catalyzed by Cu−Bis(oxazoline) Complexes
作者:Zhankui Sun、Shouyun Yu、Zuoding Ding、Dawei Ma
DOI:10.1021/ja0734849
日期:2007.8.1
CuI/bis(oxazoline)-catalyzedaddition of propiolates and terminal ynones to 1-acylpyridinium salt (generated in situ from reaction of pyridine and methyl chloroformate) affords highly functionalized dihydropyridines with excellent enantioselectivity. It is found that the carbonyl group adjacent to the alkyne moiety is essential for the enantioselectivity of the addition. Short synthesis of indolizidines