Reaction of alcohols with dihydropyran in the presence of a catalytic amount of Sc(OTf)3 provides efficiently the corresponding tetrahydropyranyl ethers. After the reaction, the catalyst can be recovered quantitatively from the aqueous media and reused without loss of the activity.
Direct conversion of alcohol silyl ethers into the corresponding diphenylmethyl (DPM) ethers can be easily performed by the reaction with diphenylmethyl formate in the presence of a catalytic amount of trimethylsilyl trifluoromethanesulfonate. By the additional use of triethylsilane, tetrahydropyranylethers can be also converted into the corresponding DPM ethers.
A Novel and Chemoselective Transformation of Alcohol Silyl Ethers into the Corresponding Tetrahydropyranyl Ethers
作者:Takeshi Suzuki、Takeshi Oriyama
DOI:10.1055/s-2001-12343
日期:——
Direct conversion of alcohol silyl ethers into the corresponding tetrahydropyranyl (THP) ethers can be easily performed by reaction with THP acetate under the influence of a catalytic amount of tert-butyldimethylsilyl trifluoromethanesulfonate (TBSOTf). Aliphatic TBS ether can be selectively transformed into the corresponding THP ether in the presence of phenolic TBS ether.
Tetrahydropyranyl or methoxymethyl ethers can be easily deprotected by treatment of-a catalytic amount of scandium trifluoromethanesulfonate along with methanol or 1,3-propanediol, respectively, to afford the corresponding parent alcohols in high to excellent yields.