Total Synthesis of (+)-Yohimbine via an Enantioselective Organocatalytic Pictet–Spengler Reaction
作者:Bart Herlé、Martin J. Wanner、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1021/jo201657n
日期:2011.11.4
Diels–Alder reaction of the type earlier reported by Jacobsen. These two key steps constitute the basis for a nine-step total synthesis of (+)-yohimbine from tryptamine. A similar asymmetric Pictet–Spengler reaction was applied to the synthesis of an intermediate in the recent total synthesis of corynantheidine by Sato.
N-(5-氧基-2,4-戊二烯基)色胺胺衍生物与5-氧代-2-(苯基硒代)戊酸甲酯的二酚磷酸催化的Pictet-Spengler反应在92:对映体比例为8。该产物很容易转化为底物,用于雅各布森早先报道的类型的立体选择性分子内Diels-Alder反应。这两个关键步骤构成了从色胺中九步全合成(+)-育亨宾的基础。相似的不对称Pictet-Spengler反应用于最近由Sato合成的Corynantheidine的中间体的合成。