A new entry for the deprotection of monothioacetals and dithioacetals: Silver nitrite - iodine system
摘要:
A new reagent system (silver nitrite-iodine) was developed for demothioacetalization and dedithioacetalization reactions. The reaction using this reagent afforded the parent carbonyl compound in excellent yield under mild conditions.
Molten Salt as a Green Reaction Medium: Efficient and Chemoselective Dithioacetalization and Oxathioacetalization of Aldehydes Mediated by Molten Tetrabutylammonium Bromide
作者:Brindaban C. Ranu、Arijit Das
DOI:10.1071/ch03318
日期:——
Tetrabutylammonium bromide in the molten state has been demonstrated to be a very efficient catalyst and reaction medium for the highly chemoselective dithioacetalization and oxathioacetalization of aldehydes. The tetrabutylammonium bromide is recycled for subsequent reactions.
Pr(OTf)<sub>3</sub> as an Efficient and Recyclable Catalyst for Chemoselective Thioacetalization of Aldehydes
作者:Surya De
DOI:10.1055/s-2004-834858
日期:——
Praseodymium triflate has been found to be an efficient and recyclable catalyst for chemoselective protection of aldehydes.
三氟甲磺酸镨已被发现是一种高效且可循环的催化剂,适用于醛的选择性保护反应。
Hydrophobic, low-loading and alkylated polystyrene-supported sulfonic acid for several organic reactions in water: remarkable effects of both the polymer structures and loading levels of sulfonic acidsElectronic supplementary information (ESI) available: Experimental details. See http://www.rsc.org/suppdata/ob/b3/b305622h/
作者:Shinya Iimura、Kei Manabe、Sh? Kobayashi
DOI:10.1039/b305622h
日期:——
A hydrophobic, low-loading and alkylated polystyrene-supported sulfonic acid (LL–ALPS–SO3H) has been developed for several organic reactions such as the hydrolysis of thioesters, the deprotection of acetals and an acetonide, and the hydration of an epoxide and an alkyne in pure water on the basis of remarkable effects of both the polymer structures and loading levels of the sulfonic acid catalysts.
Highly Efficient Transthioacetalization of O,O-Acetals Catalyzed by Indium(III) Chloride
作者:Brindaban C. Ranu、Arijit Das、Sampak Samanta
DOI:10.1055/s-2002-25347
日期:——
A simple, efficient and general procedure has been developed for the transthioacetalization of O,O-acetals catalyzed by indium(III) chloride in 1,2-dichloroethane.
the chemo- and stereo-selective sulfur removal from 5,6-dihydro-1,4-dithiins which completes the pathway to synthesize cis configurated olefins from carbonyl compounds. A four step synthesis of (Z)-9-tricosene (muscalure) with the dithiin moiety serving as the penultimate olefin precursor is also reported as an example of the proposed synthetic strategy.