Polystyrene-supported TiCl4 as a novel, efficient and reusable polymeric Lewis acid catalyst for the chemoselective synthesis and deprotection of 1,1-diacetates under eco-friendly conditions
Polystyrene-supported TiCl4 as a novel, efficient and reusable polymeric Lewis acid catalyst for the chemoselective synthesis and deprotection of 1,1-diacetates under eco-friendly conditions
Mild and Chemoselective Synthesis and Deprotection of Geminal Diacetates Catalyzed by Titanium(IV) Halides
作者:Jae-Sang Ryu、Misuk Jung、Jieun Yoon、Hak Kim
DOI:10.1055/s-0029-1218849
日期:2010.8
A novel, mild, and chemoselective method was developed for the preparation of gem-diacetates from aldehydes and acetic anhydride in the presence of titanium(IV) fluoride (1-5 mol%) under solvent-free conditions at room temperature. The reaction showed a high chemoselectivity toward aldehydes in the presence of ketones. Moreover, titanium(IV) fluoride also catalyzed the deprotection of gem-diacetates
1,3-Dibromo-5,5-dimethylhydantoin as catalyst for the conversion of aldehydes to their 1,1-diacetates (acetylals) under solvent-free and neutral conditions
Highly efficient and mild acetylation of aldehydes with aceticanhydride catalysed by 1,3-dibromo-5,5-dimethylhydantoin (DBH) was performed underneutralconditions to produce corresponding 1,1-diacetates (acetylals) in good to excellent yields.
Shindalkar; Madje; Hangarge, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2005, vol. 44, # 11, p. 2409 - 2411
作者:Shindalkar、Madje、Hangarge、Shingare
DOI:——
日期:——
Shelke, Kiran; Sapkal, Suryakant; Kategaonkar, Amol, South African Journal of Chemistry, 2009, vol. 62, p. 109 - 112
作者:Shelke, Kiran、Sapkal, Suryakant、Kategaonkar, Amol、Shingate, Bapurao、Shingare, Murlidhar S.
DOI:——
日期:——
Microwave-induced protection and deprotection of 4-oxo-(4H)-1-benzopyran-3-carbaldehydes catalysed by Envirocat EPZ10R
作者:Santosh S. Shindalkar、Balaji R. Madje、Murlidhar S. Shingare
DOI:10.1016/j.mencom.2007.01.017
日期:2007.1
An efficient, solvent-free and chemoselective procedure for the synthesis of acylals and their deprotection to 4-oxo-(4H-)1-benzopyran-3-carbaldehydes catalysed by reusable Envirocat EPZ10(R) under microwave irradiation has been carried out in good yield.