Efficient and Convenient Procedure for Protection of Hydroxyl Groups to the THP, THF and TMS Ethers and Oxidation of these Ethers to their Aldehydes or Ketones in [BPy]FeCl4 as a Low Cost Room Temperature Ionic Liquid
Selective, Convenient and Efficient Deprotection of Trimethylsilyl and Tetrahydropyranyl Ethers, Ethylene Acetals and Ketals with Oxone under Non-aqueous Conditions
An efficient and selective method for the deprotection of trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers, ethylene acetals and ketals to their corresponding alcohols and carbonyl compounds using oxone in refluxing acetonitrile is described. Excellent chemoselectivity of this method makes it a useful and practical procedure in organic synthesis.
Efficient and Selective Oxidative Deprotection of Tetrahydropyranyl Ethers, Ethylene Acetals and Ketals with Silver and Sodium Bromates in the Presence of Aluminum Chloride
作者:Iraj Mohammadpoor-Baltork、Ali Reza Nourozi
DOI:10.1055/s-1999-3410
日期:1999.3
Primary and secondary tetrahydropyranyl (THP) ethers are efficiently transformed to their carbonyl compounds with AgBrO3 and NaBrO3/AlCl3. Ethylene acetals and ketals are transformed to their carboxylic acids and ketones respectively with AgBrO3/AlCl3 in refluxing acetonitrile. AgBrO3/AlCl3 is also able to transform ethylene acetals to aldehydes in refluxing carbon tetrachloride in high yields. In refluxing acetonitrile, ethylene acetals and ketals are transformed to aldehydes and ketones with NaBrO3/AlCl3. We have also found that tetrahydropyranyl ethers are oxidized selectively in the presence of ethylene acetals and ketals with these reagents.
Potassium dodecatangestocobaltate trihydrate (K 5 CoW 12 O 40 ·3H 2 O): a mild and efficient catalyst for the tetrahydropyranylation of alcohols and their detetrahydropyranylation
作者:Mohammad H Habibi、Shahram Tangestaninejad、Iraj Mohammadpoor-Baltork、Valiollah Mirkhani、Bahram Yadollahi
DOI:10.1016/s0040-4039(01)00298-2
日期:2001.4
A simple, mild and effective method for tetrahydropyranylation of a variety of alcohols and cleavage of their tetrahydropyranyl ethers at ambient temperature in the presence of K5CoW12O40·3H2O as the catalyst with high turnovers is described.
描述了一种简单,温和而有效的方法,该方法用于在室温下,在具有高周转率的催化剂K 5 CoW 12 O 40 ·3H 2 O的存在下,对多种醇进行四氢吡喃基化并裂解其四氢吡喃基醚。