6-sulfonyl chromans
US4946971A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Apr 20, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A class of novel chemical compounds comprising derivatives of 2,2,5,7,8-pentamethylchroman-6-sulphonyl and having the structural formula ##STR1## wherein X is selected from halogen and other groups having acidic functionality. We prefer that the X-group be chlorine. The said compounds are made by the sulphonation of 2,2,5,7,8-pentamethylchroman, preferably using chlorosulphonic acid. The primary utility of the compounds of the present invention is in the protection of functional groups in organic synthesis and more particularly in the protection of basic functional amino groups, such as amidines and guanidines. The invention also provides a method of making the protecting group and a protected amino acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.