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。