Asymmetric Intermolecular Heck Reaction of Propargylic Acetates and Cycloalkenes to Access Fused Cyclobutenes
作者:Zhiwei Jiao、Qi Shi、Jianrong Steve Zhou
DOI:10.1002/anie.201708435
日期:2017.11.13
An intermolecular Heck reaction between propargylicacetates and cyclic olefins results in the enantioselective synthesis of highly strained cyclobutenes.
Asymmetric Wacker‐Type Oxyallenylation and Azaallenylation of Cyclic Alkenes
作者:Shenghan Teng、Zhiwei Jiao、Yonggui Robin Chi、Jianrong Steve Zhou
DOI:10.1002/anie.201911961
日期:2020.2.3
Palladium-catalyzed three-component carboetherification of cyclic alkenes proceeded to give trans adducts exclusively with excellent enantioselectivity through a Wacker-type pathway. The reaction is also applicable to other oxygen nucleophiles, such as water, phenols, and carboxylic acids, as well as some electron-poor aryl amines.
A catalytic amount of silver benzoate with 7‐methyl‐1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (MTBD) was an effective catalytic system for the reaction of carbondioxide with various ketones containing an alkyne group at an appropriate position (see scheme). These reactions afforded the corresponding γ‐lactone derivatives in good to high yields under mild conditions.