Process for producing optically active chromene derivative
US6479671B1 · kind B1 · utility
3Cited by
1References
2Claims
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Key dates
| Filing date | Aug 15, 2000 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Aug 15, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for producing a compound of the formula (II): (wherein R1, R2, R3 and R4 are each independently hydrogen, alkyl, alkoxy or the like, R5 is alkyl or alkoxyalkyl, A is O or S, Ar is aryl or the like, * represents the position of an asymmetric carbon atom and that the compound is the (R) or (S) isomer and Q is an optical resolution reagent)comprising isolating the compound as crystals from a solution or suspension containing the compound of the formula (II) (wherein * represents that the compound is the (R) or (S) isomer or a mixture thereof and the other symbols are the same as the above).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.