Efficient Nazarov Cyclizations of 2-Alkoxy-1,4-pentadien-3-ones
摘要:
[GRAPHICS]Expeditious and high-yielding Nazarov cyclizations of 2-alkoxy-1,4-pentadien-3-ones are described. An example of a catalytic asymmetric Nazarov cyclization is presented.
Hydroxylamine catalyzed Nazarov cyclizations of divinyl ketones
作者:Joseph Z. Hamilton、Nathaniel T. Kadunce、Michael D. McDonald、Laura Rios、Albert R. Matlin
DOI:10.1016/j.tetlet.2015.10.039
日期:2015.11
The first examples of iminium catalyzed Nazarov cyclizations of divinyl ketones are presented. Experiments describing hydroxylamine catalysis of the cyclization of eight alpha-alkoxy divinyl ketones (60-79% yield) and one unactivated divinyl ketone (38% yield) are reported. Phenyl substitution at the beta-position of the divinyl ketone inhibits cyclization, whereas beta-alkyl substituted beta-alkoxy divinyl ketones readily cyclize. (C) 2015 Elsevier Ltd. All rights reserved.