Iodine–alumina as an efficient and useful catalyst for the regeneration of carbonyl functionality from the corresponding 1,3-oxathiolanes and 1,3-dithiolanes in aqueous system
摘要:
A simple and useful method has been demonstrated for the deprotection of 1,3-oxathiolanes and 1,3-dithiolanes to the corresponding carbonyl compounds in excellent yield by employing catalytic amount (30 mol %) of iodine supported on neutral alumina in ethanol-water or water. The major advantages of this protocol are mild reaction conditions, less reaction time, easy to handle, high yields, inexpensive reagent and environmentally benign. (C) 2010 Elsevier Ltd. All rights reserved.
Microwave-mediated Efficient Protection of Carbonyl Compounds as 1,3-Oxathiolanes in the Presence of Iodine under Solvent Free Condition
作者:Ghanashyam Bez、Nabajyoti Baruah
DOI:10.1246/cl.2006.542
日期:2006.5
A mild, efficient, and solvent free protocol for conversion of aldehydes and ketones into their corresponding 1,3-oxathiolanes using 2-mercaptoethanol in the presence of catalytic amount of elemental iodine is reported.
Nickel(II) chloride hexahydrate catalyzed reaction of aromatic aldehydes with 2-mercaptoethanol: formation of supramolecular helical assemblage of the product
作者:Rajibul A. Laskar、Naznin A. Begum、Mohammad Hedayetullah Mir、Md. Rumum Rohman、Abu T. Khan
DOI:10.1016/j.tetlet.2013.08.070
日期:2013.10
Various aromatic aldehydes on reaction with 2-mercaptoethanol provided an unanticipated product, bis(2-hydroxyethyl)dithioacetals (3) as the major product along with the expected product 1,3-oxathiolanes (4) in the presence of 0.05 equiv amount of nickel(II) chloride hexahydrate (NiCl2·6H2O) under solvent-free conditions. Products 3c and 3e exhibit an interesting hydrogen-bonded infinite supra-molecular