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
Nickel-catalyzed couplings and cyclizations involving allenes, aldehydes, and organozincs
作者:Minsoo Song、John Montgomery
DOI:10.1016/j.tet.2005.08.066
日期:2005.11
Cyclizations of allenyl aldehydes and intermolecular couplings of allenes and aldehydes provide a direct procedure for the preparation of homoallylic alcohols. The couplings and cyclizations involve the use of diorganozine reagents as reducing agents and Ni(COD)(2) as the catalyst. (c) 2005 Elsevier Ltd. All rights reserved.