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)-catalyzed addition 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
CuI/双(恶唑啉)催化丙炔酸酯和末端炔酮加成到 1-酰基吡啶鎓盐(由吡啶和氯甲酸甲酯反应原位生成)得到高度官能化的二氢吡啶,具有优异的对映选择性。发现与炔部分相邻的羰基对于加成的对映选择性是必不可少的。吲哚里西啶 167B 和 223AB 的短合成是通过使用两种加成产物实现的。