Domino Formation of Enamines - Intramolecular Cyclizations to 1-Aminotetralins from γ-Arylallene Aldehydes and Amines
摘要:
1,5-/1,6-Allenals conjugated to an aromatic ring undergo a cyclization, in the presence of an amine, that leads to tricyclic compounds including the 1-aminotetralin scaffold. This domino process combines the in situ formation of the enamine and the cyclization affording the tricyclic 1-aminotetralins in very high diastereoselectivities.
Domino Formation of Enamines - Intramolecular Cyclizations to 1-Aminotetralins from γ-Arylallene Aldehydes and Amines
摘要:
1,5-/1,6-Allenals conjugated to an aromatic ring undergo a cyclization, in the presence of an amine, that leads to tricyclic compounds including the 1-aminotetralin scaffold. This domino process combines the in situ formation of the enamine and the cyclization affording the tricyclic 1-aminotetralins in very high diastereoselectivities.
Reactions Involving Tryptamines and δ-Allenyl Aldehydes: Competition between Pictet-Spengler Reaction and Cyclization to 1-Aminotetralins
作者:Valérian Gobé、Vincent Gandon、Xavier Guinchard
DOI:10.1002/adsc.201701487
日期:2018.3.20
course of Pictet‐Spengler reactionsbetween tryptamines and δ‐allenyl aldehydes. This discovery led to the study of a novel reactivity using aldehydes and secondary amines. DFT calculations show that the cyclization occurs in a stepwise manner that is sufficiently fast to allow high diastereoselectivity. When using allyl‐tryptamines, it is possible to control the reaction, depending on the substituents
1,5-/1,6-Allenals conjugated to an aromatic ring undergo a cyclization, in the presence of an amine, that leads to tricyclic compounds including the 1-aminotetralin scaffold. This domino process combines the in situ formation of the enamine and the cyclization affording the tricyclic 1-aminotetralins in very high diastereoselectivities.