Lithium Hexafluorophosphate-Catalyzed Efficient Tetrahydropyranylation of Tertiary Alcohols under Mild Reaction Conditions
作者:Tsuneo Sato、Nao Hamada
DOI:10.1055/s-2004-829550
日期:——
Lithium hexafluorophosphate is found to be an efficientcatalyst for the tetrahydropyranylation of tertiary alcohols with dihydropyran under mild reaction conditions.
在温和的反应条件下,六氟磷酸锂被发现是叔醇与二氢吡喃的四氢吡喃化反应的有效催化剂。
A Mild and Efficient Method for Tetrahydropyranylation/Depyranylation of Alcohols and Phenols Under Neutral Conditions
Abstract Alcohols and phenols are tetrahydropyranylated rapidly in high yields in the presence of lithium bromide and dichloromethane at room temperature. Deprotection of these THP ethers can also be effected readily by mere change of the solvent to methanol and refluxing with excess lithium bromide. Due to neutral reaction conditions employed, the method is also compatible with compounds having acid
A Mild and Efficient Tetrahydropyranylation of Alcohols
作者:Kyung Hoi Cha、Tae Won Kang、Hong-Woo Lee、Eung-Nam Kim、Nam-Hee Choi、Jung-Woo Kim、Chung Il Hong
DOI:10.1080/00397919808007027
日期:1998.6
Abstract Triphenylphosphine (TPP)-iodotrimethylsilane (TMSI) was found to be a convenient and highly effective catalyst for the tetrahydropyranylation of aliphatic and aromatic alcohols with dihydropyran in dichloromethane at ambient temperature.
Lithium triflate (LiOTf) catalyzed efficient and chemoselective tetrahydropyranylation of alcohols and phenols under mild and neutral reaction conditions
作者:Babak Karimi、Jafar Maleki
DOI:10.1016/s0040-4039(02)00892-4
日期:2002.7
Different types of alcohols and phenols were effectively converted to the corresponding THP ethers in the presence of DHP and a catalytic amount of lithium trifluoromethanesulfonate (LiOTf) in refluxing 1,2-dichloroethane under essentially neutral reaction conditions. The method also shows good chemoselectivity for mono-tetrahydropyranylation of symmetrical diols.