Process for the preparation of indolines
US4886887A · kind A · utility
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2References
23Claims
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Assignee
Inventors
Key dates
| Filing date | Oct 9, 1986 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Oct 9, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Indolines of the formula ##STR1## wherein R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl and each of R.sub.2 and R.sub.3 independently of the other is hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, are prepared by cyclodehydrating a 2-(2'-aminophenyl)ethanol of formula ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, at 150.degree.-350.degree. C. in the presence of an amorphous aluminum silicate. The indolines of the above formula are useful intermediates for the synthesis of plant protective agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.