For the first time, it has been shown that 2,6-dicyanopiperidines are formed in the Fry reaction via 1,4-dihydropyridine intermediates. A new synthetic approach for building 2,6-dicyanopiperidine derivatives by an extension of the sodium dithionite reduction of pyridinium salts is described. The stereochemistry of 2,6-dicyanopiperidine derivatives formed is discussed.
1-(3-Indolyl)-tetrahydropyridine der Formel
worin R Wasserstoff oder Methoxy bedeutet, haben nootrope Wirkung und können als Nootropika Verwendung finden. Sie werden beispielsweise hergestellt, indem man Verbindungen der Formeln
worin X3 eine nukleofuge Abgangsgruppe bedeutet, oder deren Salze miteinander umsetzt
式中 R 表示氢或甲氧基的 1-(3-吲哚基)-四氢吡啶类化合物具有促睡眠活性,可用作促睡眠剂。 例如,它们是由式中 X3 表示离核基团的化合物或它们的盐彼此反应制备而成的
Bioinspired Collective Total Synthesis of (±)-Rhynchines A–E
Herein, we present the first racemic totalsynthesis of the structurally complex monoterpene indole alkaloids rhynchines A–E, starting from commercially available methyl nicotinate and 3-(2-bromoethyl)-1H-indole. The success of our synthesis is attributed to the utilization of a bioinspired synthetic strategy, which facilitated the rapid construction of the pentacyclic core skeleton of the target molecules