O-(Aminosulfonylation) of phenols and an example of slow hydrolytic release
摘要:
Sequential replacement of imidazole from sulfonyldiimidazole by phenols and then amines leads to O-arylsulfamate esters. Application of this coupling method to 19 phenols and 6 amines generates a library of 114 sulfamate esters, Ar-OSO2-NR2. A sulfamate based conjugate of ethinyl estradiol was prepared by using the steroid 3-hydroxyl as the phenol component, and an amino amide derived from linoleic acid as the amine. Hydrolysis of this conjugate was studied in aqueous buffer at pH values 2, 5, and 7.4, and (essentially identical) respective half-lives of 6.8, 6.6, and 6.7 days were observed. (C) 2014 Elsevier Ltd. All rights reserved.
Directed Ortho Metalation Methodology. The <i>N</i>,<i>N</i>-Dialkyl Aryl <i>O</i>-Sulfamate as a New Directed Metalation Group and Cross-Coupling Partner for Grignard Reagents
作者:Todd K. Macklin、Victor Snieckus
DOI:10.1021/ol050393c
日期:2005.6.1
with a variety of electrophiles constitutes a new generalroute to substituted aryl O-sulfamates 4a-k. The Kumada-Corriu cross-coupling of O-sulfamates 4e, 4n-s, and 6a with Grignard reagents gives biaryls 9a-m, and the use of 2-halo and boron derivatives 4h, 4i, and 4k for Suzuki-Miyaura cross-coupling and generation of benzynes leads to naphthols 7a and 7b. A relative metalation ranking of the OSONEt(2)