(RuCp*Cl-2)(2), a general entry into Cp*Ru sandwich and half-sandwich chemistry was first used as a precatalyst in allylic etherification of cinnamyl chlorides with up to 98:2 regioselectivity (19 examples). Both the solvent effect and the exsiccant reaction condition are crucial to the reactivity and selectivity. Preliminary mechanism studies and the demonstration of Fluoxetine synthesis were presented in this work as well. (C) 2013 Elsevier Ltd. All rights reserved.
Nickel-Catalyzed Removal of Alkene Protecting Group of Phenols, Alcohols via Chain Walking Process
作者:Chenkai Meng、Haolin Niu、Juehan Ning、Wengang Wu、Jun Yi
DOI:10.3390/molecules25030602
日期:——
nickel-catalyzed removal of alkene protection group under mild condition with high functional group tolerance through chain walking process has been established. Not only phenolic ethers, but also alcoholic ethers can be tolerated with the retention of stereocenter adjacent to hydroxyl group. The new reaction brings the homoallyl group into a start of new type of protectinggroup.
Ring-closing metathesis as a new methodology for the synthesis of monomeric flavonoids and neoflavonoids
作者:Bradley J. Miller、Tanya Pieterse、Charlene Marais、Barend C.B. Bezuidenhoudt
DOI:10.1016/j.tetlet.2012.06.094
日期:2012.8
Basic flavonoid (flavene) and neoflavonoid (neoflavene) skeletons were successfully synthesized using ring-closingmetathesis, showing that this methodology can be used as a central synthetic tool for the synthesis of at least two of the three basic flavonoid classes.