Dual-Organocatalyst-Promoted Asymmetric Cascade Reaction: Highly Efficient Construction of Enantiopure Fully Substituted Tetrahydro-1,2-oxazines
作者:Hua Lin、Xing-Wen Sun、Guo-Qiang Lin
DOI:10.1021/ol403463h
日期:2014.2.7
A four-component asymmetric α-aminoxylation/aza-Michael/Mannich cascade reaction for the construction of fully substituted chiral tetrahydro-1,2-oxazine derivatives was accomplished in high yields with excellent enantio- and diastereoselectivities under mild conditions. The 1,2-oxazine derivative could be transformed to the corresponding multifunctional chiral amino alcohol by N–O cleavage and fused-tricyclic
用于构建完全取代的手性四氢-1,2-恶嗪衍生物的四组分不对称α-氨氧基化/氮杂-Michael / Mannich级联反应可以在温和条件下以高收率和出色的对映选择性和非对映选择性完成。通过N-O裂解和稠合的三环4-氨基取代的四氢喹啉,可以将1,2-恶嗪衍生物转化为相应的多功能手性氨基醇,并具有良好的立体选择性,然后进行Friedel-Crafts反应。通过4-氨基取代的四氢喹啉的C-4转化也可以得到4-烷氧基取代的四氢喹啉。