Solvent and in situ catalyst preparation impacts upon Noyori reductions of aryl-chloromethyl ketones: application to syntheses of chiral 2-amino-1-aryl-ethanols
摘要:
As part of medicinal chemistry efforts we found it necessary to develop general syntheses of highly enantiomerically enriched 1-aryl-2-chloroethanols and 1-aryl-2-methylaminoethanols. A survey of literature methods suggested that a truly general approach had not yet been reported, encouraging us to undertake the development of such a methodology. This study describes the design, development, and reduction to practice of a general synthesis of chiral 1-aryl-2-chloroethanols and the transformation of these entities to highly enantiomerically enriched 1-aryl-2-methylaminoethanols. Of particular importance were observations of the impact of solvent and the method of catalyst preparation on the yield and enantiomerical excess of chlorohydrins prepared via Noyori transfer hydrogenations of aryl-chloromethyl ketones. (c) 2006 Elsevier Ltd. All rights reserved.
Solvent and in situ catalyst preparation impacts upon Noyori reductions of aryl-chloromethyl ketones: application to syntheses of chiral 2-amino-1-aryl-ethanols
摘要:
As part of medicinal chemistry efforts we found it necessary to develop general syntheses of highly enantiomerically enriched 1-aryl-2-chloroethanols and 1-aryl-2-methylaminoethanols. A survey of literature methods suggested that a truly general approach had not yet been reported, encouraging us to undertake the development of such a methodology. This study describes the design, development, and reduction to practice of a general synthesis of chiral 1-aryl-2-chloroethanols and the transformation of these entities to highly enantiomerically enriched 1-aryl-2-methylaminoethanols. Of particular importance were observations of the impact of solvent and the method of catalyst preparation on the yield and enantiomerical excess of chlorohydrins prepared via Noyori transfer hydrogenations of aryl-chloromethyl ketones. (c) 2006 Elsevier Ltd. All rights reserved.
Photoredox-catalyzed synthesis of sulfones through deaminative insertion of sulfur dioxide
作者:Xuefeng Wang、Yunyan Kuang、Shengqing Ye、Jie Wu
DOI:10.1039/c9cc08333b
日期:——
radical precursors with the insertion of sulfurdioxide under photoredox catalysis. This transformation first enables direct generation of various alkylsulfonyl radicals by photoinduced single electron reduction, leading to diverse dialkyl sulfones in good to excellent yields. A radical pathway is proposed under visible-light induced conditions with the insertion of sulfurdioxide.
Generation of sulfonylureas under photoredox catalysis and their biological evaluations
作者:Xuefeng Wang、Jun Zhang、Qi Chen、Wei Zhou、Jie Wu
DOI:10.1016/j.cclet.2022.02.025
日期:2022.11
Traditional synthesis of sulfonylureas largely depends on nucleophilic addition of arylsulfonamides to pre-synthesized isocyanates. Now we report a new access to alkylsulfonylureas with good yields and broad substrate scope. With the insertion of commercialized chlorosulfonyl isocyanate under photoredox catalysis, alkylsulfonylureas are synthesized in one-pot from the corresponding anilines and silyl
The present invention provides a compound of formula I
1
or a pharmaceutically acceptable salt thereof wherein R
1
, R
2
and R
3
are as defined in the specification. The compounds are useful for the treatment of viral infections.