Highly Enantioselective Claisen Rearrangement of Imidates Derived from Primary Allyl Alcohols
作者:Peter Metz、Benno Hungerhoff
DOI:10.1021/jo970123a
日期:1997.6.1
A highly enantioselective and diastereoselective Claisen rearrangement of N-arylimidates derived from an axially chiral binaphthylamine auxiliary is reported. Upon deprotonation of the imidates with lithium diethylamide, the resultant azaenolates rearrange at 0 degrees C to give anti alpha,beta-disubstituted, gamma,delta-unsaturated N-binaphthyl amides. A iodolactonization/zinc reduction sequence readily
报道了衍生自轴向手性联萘胺助剂的N-芳基亚氨酸酯的高度对映选择性和非对映选择性克莱森重排。用二乙酰胺锂使酰亚胺化物去质子化后,所得的氮杂烯化物在0℃下重排,得到抗α,β-二取代的,γ,δ-不饱和的N-联萘酰胺。碘内酯化/锌还原顺序可以轻松地将这些酰胺转化为91-95%ee的相应羧酸,并可以有效回收手性助剂。