Enantioselective Construction of Octahydroquinolines via Trienamine-Mediated Diels–Alder Reactions
作者:Taichi Inoshita、Kei Goshi、Yuka Morinaga、Yuhei Umeda、Hayato Ishikawa
DOI:10.1021/acs.orglett.9b00932
日期:2019.4.19
Diels–Alder reaction using a 5-nitro-2,3-dihydro-4-pyridone derivative as a dienophile in the presence of a secondary amine organocatalyst derived from cis-hydroxyproline was discovered. The reaction provides optically active octahydroquinolines through an endo-selective [4 + 2] cyclization pathway. The following stereoselective denitration, isomerization, and/or hydrogenation generated divergent stereoisomers
在衍生自顺式-羟基脯氨酸的仲胺有机催化剂存在下,发现了使用三硝基胺介导的不对称Diels-Alder反应,该反应使用5-硝基-2,3-二氢-4-吡啶酮衍生物作为亲二烯体。该反应通过内选的[4 + 2]环化途径提供旋光的八氢喹啉。随后的立体选择性脱硝,异构化和/或氢化生成十氢喹啉的发散立体异构体,它们是总合成石蒜生物碱的有用合成子。