L-tartaric acid salt of a (1R) diastereomer of a 2-azadihydroxybicyclo2.2.1!heptane compound and the preparation of 2-azabicyclo2.2.1! heptane compounds
US5831096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Jun 10, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for the preparation of a compound of formula ##STR1## wherein R is hydrogen or, respectively, a group of formula ##STR2## R.sub.1 is alkyl; Ar is optionally substituted aryl; and PA1 R.sub.3' and R.sub.3" are hydrogen, alkyl or phenyl, or R.sub.3' and R.sub.3" taken together with the carbon atom to which they are attached form cycloalkyl, or salt thereof, comprising acid facilitated acetalizing or ketalizing of a compound of formula ##STR3## wherein R.sub.3' and R.sub.3" are as defined above, and R.sub.4' and R.sub.4" are alkoxy, or taken together with the carbon atom to which they are attached form carbonyl, with a compound of formula ##STR4## wherein * represents an R chirality; PA1 R, R.sub.1 and Ar are as defined above, or salt thereof in isopropanol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.