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.
Dicyanoketene Ethylene Acetal as a Mild and Efficient Catalyst for Tetrahydropyranylation of Alcohols
作者:Tsuyoshi Miura、Yukio Masaki
DOI:10.1080/00397919508015875
日期:1995.7
Abstract Alcohols can react with 3,4-dihydro-2H-pyran in the presence of a catalytic amount of dicyanoketene ethylene acetal under neutral conditions to afford the corresponding tetrahydropyranyl ethers in good yields.
DABCO–Bromine Complex: A Novel Oxidizing Agent for Oxidative Deprotection of THP and Silyl Ethers and Semicarbazones to Corresponding Carbonyl Compounds
作者:Mahmood Tajbakhsh、Majid M. Heravi、Setareh Habibzadeh
DOI:10.1080/00397910701473234
日期:2007.8.1
Abstract A tetrameric DABCO–bromine complex was synthesized, characterized, and utilized as a novel active bromine complex for the oxidative deprotection of THP and silyl ethers and semicarbazones to carbonyl compounds.
Efficient and Ecofriendly Protocol for Tetrahydropyranylation/Depyranylation of Alcohols in the Presence of Tin(II) Chloride Dihydrate
作者:Dipankoj Gogoi、Nabajyoti Baruah、Ghanashyam Bez
DOI:10.1080/00397910601055123
日期:2007.3
Abstract A mild, efficient, and solvent‐free protocol for tetrahydropyranylation of alcohols in the presence of a catalytic amount of SnCl2 · 2H2O is reported. Simple filtration of the reaction mixture through a short silica‐gel pad gives the pure products in excellent yields. Depyranylation can also be achieved by adding methanol under similar reaction conditions.
Chloral Hydrate as a Water Carrier for the Efficient Deprotection of Acetals, Dithioacetals, and Tetrahydropyranyl Ethers in Organic Solvents
作者:Sosale Chandrasekhar、Annadka Shrinidhi
DOI:10.1080/00397911.2013.876652
日期:2014.7.3
Abstract The efficientdeprotection of several acetals, dithioacetals, and tetrahydropyranyl (THP) ethers under ambient conditions, using chloral hydrate in hexane, is described. Excellent yields were realized for a wide range of both aliphatic and aromatic substrates. The method is characterized by mild conditions (room temperatures or below), simple workup, and the ready availability of chloral hydrate