A concise approach for the synthesis of 3-iodoindoles and 3-iodobenzo[b]furans via Ph3P-catalyzed iodocyclization
作者:Yin-Long Li、Jian Li、Sheng-Nan Yu、Ji-Bo Wang、Yan-Min Yu、Jun Deng
DOI:10.1016/j.tet.2015.09.005
日期:2015.10
A variety of 3-iodoindole and 3-iodobenzo[b]furan derivatives were conveniently prepared from the corresponding 2-alkynylanilines and 2-alkynylphenols through Ph3P-catalyzed iodocyclization in the presence of N-iodosuccinimide (NIS). This protocol provides a rapid access to 3-iodoindoles and 3-iodobenzo[b]furans in good to excellent yields under mild conditions.
We present herein the first visible-light-driven hydrocarboxylation as well as carbocarboxylation of alkynes using CO2 via an iridium/cobalt dual catalysis. Such transformations provide access to various pharmaceutically important heterocycles in a one-pot procedure from readily available alkynes. Coumarins, 2-quinolones, and 2-benzoxepinones were directly accessed through a one-pot alkyne hydrocarboxylation/alkene
我们在此展示了第一个可见光驱动的烃羧化以及通过铱/钴双催化使用 CO2 的炔烃的羧化。这种转化提供了通过一锅法从容易获得的炔烃获得各种药学上重要的杂环的途径。通过一锅炔烃加氢羧化/烯烃异构化/环化序列直接获得香豆素、2-喹诺酮和 2-苯并氧杂环酮,其中 Ir 光催化剂起到双重作用,促进炔烃加氢羧化中的单电子转移和随后的能量转移烯烃异构化。此外,前所未有的钴羧化/酰基迁移级联使炔双官能化能够高效引入γ-羟基丁烯内酯。
Gold-Catalyzed Cyclizations of (<i>o</i>-Alkynyl)phenoxyacrylates with External Nucleophiles: Regio- and Stereoselective Synthesis of Functionalized Benzo[<i>b</i>]oxepines
作者:Jun Liu、Yuanhong Liu
DOI:10.1021/ol302252h
日期:2012.9.21
A catalytic approach to benzo[b]oxepines with high stereoselectivity by Au-catalyzed cyclization of (o-alkynyl)phenoxyacrylates with various nucleophiles under mild reaction conditions has been developed. Notably, the use of vinyl ether instead of alcohol could afford the same benzoxepines. The reaction may proceed by Au-catalyzed oligomerization of vinyl ether to release the alcohol, which then reacts with (o-alkynyl)phenoxyacrylates to furnish the benzoxepines.