Synthesis and Protection of Aryl Sulfates Using the 2,2,2-Trichloroethyl Moiety
摘要:
[GRAPHICS]The 2,2,2-trichloroethyl (TCE) group was utilized as the first protecting group for aryl sulfates. Aryl sulfates, protected with the TCE group, were prepared in high yield by reacting phenols with chlorosulfuric acid TCE ester. Deprotection was accomplished using Pd/C-ammonium formate or with Zn-ammonium formate to give aryl sulfate monoesters in high yield. This approach to aryl sulfate synthesis was successfully applied to the construction of estrone sulfate derivatives, which could not be prepared by previous methodologies.
Synthesis and Protection of Aryl Sulfates Using the 2,2,2-Trichloroethyl Moiety
摘要:
[GRAPHICS]The 2,2,2-trichloroethyl (TCE) group was utilized as the first protecting group for aryl sulfates. Aryl sulfates, protected with the TCE group, were prepared in high yield by reacting phenols with chlorosulfuric acid TCE ester. Deprotection was accomplished using Pd/C-ammonium formate or with Zn-ammonium formate to give aryl sulfate monoesters in high yield. This approach to aryl sulfate synthesis was successfully applied to the construction of estrone sulfate derivatives, which could not be prepared by previous methodologies.
Rapid and efficient chemoselective and multiple sulfations of phenols using sulfuryl imidazolium salts
作者:Scott D. Taylor、Ahmed Desoky
DOI:10.1016/j.tetlet.2011.04.080
日期:2011.6
Phenolic sulfates protected with a trichloroethyl or trifluoroethyl group were rapidly and efficiently obtained by reacting phenols with sulfuryl imidazolium salts in the presence of DBU. Phenolic hydroxyl groups could be sulfated in good yield in the presence of aliphatic hydroxyl groups and multiple sulfations were also readily achieved. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and Protection of Aryl Sulfates Using the 2,2,2-Trichloroethyl Moiety
作者:Yong Liu、I-Feh Felicia Lien、Scott Ruttgaizer、Peter Dove、Scott D. Taylor
DOI:10.1021/ol036157o
日期:2004.1.1
[GRAPHICS]The 2,2,2-trichloroethyl (TCE) group was utilized as the first protecting group for aryl sulfates. Aryl sulfates, protected with the TCE group, were prepared in high yield by reacting phenols with chlorosulfuric acid TCE ester. Deprotection was accomplished using Pd/C-ammonium formate or with Zn-ammonium formate to give aryl sulfate monoesters in high yield. This approach to aryl sulfate synthesis was successfully applied to the construction of estrone sulfate derivatives, which could not be prepared by previous methodologies.