The synthesis and structures of arene-substituted azadipyrromethenes
摘要:
We present the synthesis of several azadipyrromethenes with four peripheral arene units which can be readily generated via the well-established chalcone synthetic method. The stability and yields of these azadipyrromethenes is highly dependent on the nature of the arene substituent, with the bis-pyridine systems exhibiting the highest degree of instability. The structures of several of the compounds and their BF2 adducts are presented; intramolecular hydrogen bonding is observed in the free base ADPMs. We also present a study into the absorption and emission properties of the ADPMs and their BF2 adducts and observe that they are also highly dependent on the identity of the substituents. (C) 2015 Elsevier Ltd. All rights reserved.
Enantioselective Copper‐Catalyzed Formal [2+1] and [4+1] Annulations of Diynes with Ketones via Carbonyl Ylides
作者:Lin‐Jun Qi、Cui‐Ting Li、Zheng‐Qi Huang、Jia‐Tian Jiang、Xin‐Qi Zhu、Xin Lu、Long‐Wu Ye
DOI:10.1002/anie.202210637
日期:2022.10.24
A copper-catalyzed asymmetric formal [2+1] and [4+1] annulation of diynes with ketones via carbonyl ylides is disclosed. This protocol enables the divergent, practical and atom-economical synthesis of a range of chiral oxiranes and dihydrofurans in moderate to excellent yields with generally excellent enantioselectivities and diastereoselectivities.