stable orthoquinone monoketals, and thus constitutes a valuable alternative to the use of chemical oxidants that are often based on toxic metallic species. The propionic acid derivatives are initially converted into O-spirolactonic quinonebisketals that are then selectively hydrolyzed into the desired monoketal compounds. In the absence of blocking substituents, orthoquinone monoketals spontaneously undergo
A Novel Chemoselective Cleavage of (<i>tert</i>-Butyl)(dimethyl)silyl (TBS) Ethers Catalyzed by Ce(SO<sub>4</sub>)<sub>2</sub>⋅4 H<sub>2</sub>O
作者:Davir González-Calderón、Carlos A. González-González、Aydeé Fuentes-Benítez、Erick Cuevas-Yáñez、David Corona-Becerril、Carlos González-Romero
DOI:10.1002/hlca.201300354
日期:2014.7
(tert‐Butyl)(dimethyl)silyl (tBuMe2Si; TBS) phenyl/alkyl ethers were efficiently cleaved to the corresponding parent hydroxy compounds in good yields usingcatalyticamounts of Ce(SO4)2⋅4 H2O by microwave‐assisted or conventional heating in MeOH. Intramolecular and competitive experiments demonstrated the chemoselective deprotection of TBS ethers in the presence of triisopropylsilyl (iPr3Si; TIPS)