Acid-Catalyzed Intramolecular Ring-Opening Reactions of Cyclopropanated Oxabenzonorbornadienes with Carboxylic Acid Nucleophiles
作者:William Tam、Angel Ho、Austin Pounder、Samuel Koh、Matthew P. Macleod、Emily Carlson
DOI:10.1055/a-1672-2260
日期:2022.3
(CPOBDs) to undergo ring-opening reactions in mild acidic conditions. The optimized reaction conditions involve the use of pTsOH in DCE at 90 °C. Two regioisomers are formed but the reactions are highly regioselective towards type 3 ring-opened products. It was observed that substitution at the C5 and aryl positions of CPOBD significantly hinders the ring-opening reactions leading to decreased yields of
Intramolecular Palladium-Catalyzed Ring Opening of Oxabenzonorbornadienes with C<sub>1</sub>-Tethered Aryl Halides
作者:Samuel Koh、Austin Pounder、Elizabeth Brown、William Tam
DOI:10.1021/acs.orglett.0c00900
日期:2020.5.1
The novel intramolecularringopening of oxabenzonorbornadienes with C1-tethered aryl halides was investigated using palladium catalysts to form fused tetracyclic frameworks. The reaction was generally found to synthesize 1,2-dihydronaphthalen-1-ol products with mild selectivity but was capable of synthesizing dehydrated naphthalene products in excellent yield and selectivity. Substituent effects on
Intramolecular Nickel-Catalyzed Ring-Opening Reactions of Oxabenzonorbornadienes with C<sub>1</sub>
-Tethered Aryl Halides: An Improvement of Method
作者:Samuel Koh、Austin Pounder、Elizabeth Brown、William Tam
DOI:10.1002/ejoc.202000672
日期:2020.8.9
Oxabenzonorbornadienes with C1‐tethered aryl halides were found to rapidly undergo a ring‐opening reaction in the presence of NiCl2(PPh3)2, Zn, and MeCN to selectively form 1,2‐dihydronaphthalen‐1‐ol cores. 17 examples are shown with varying oxabenzonorbornadiene and iodoarene substitution, tether length, and halides, with yields up to 99 %.