Potassium Hydroxide → HCID 57936081, compound

Temperature

80 °C

Benzene ruthenium(II)chloride dimmer (0.17 g, 0.0008 mol, 0.02 eq), (1R,2S)-(+)-cis-1-Amino-2-indanol (0.207 g, 0.0013 mol, 0.08 eq) were taken in nitrogen bubbled IPA (50 ml). This solution was heated at 80° C. for 20 min and cooled back to RT. Step-a product (2.8 g, 0.017 mol) was taken in nitrogen bubbled IPA (78 ml), a solution of KOH (0.19 g, 0.0034 mol, 0.2 eq) in IPA (40 ml) and the earlier prepared ruthenium solution were added drop wise simultaneously at RT. The overall reaction mixture was heated to 50° C. and stirred for 30 min at the same temperature. Progress of the reaction was monitored by TLC (50% ethyl acetate/hexane, Rf˜0.2). On completion of the reaction, cooled the reaction contents to rt, filtered on a silica gel bed and the bed was washed with ethyl acetate (2×30 ml). Filtrate was concentrated under reduced pressure, residue was taken in DCM (75 ml) and treated with charcoal. Filtered the contents over a silica gel bed and the bed washed with DCM (4×30 ml). DCM was distilled off completely and the crude obtained was purified by column chromatography (silica gel, 20% ethyl acetate/hexane) to yield the titled product as a red colored solid (1.8 g, 63% yield, mp 89-94° C.).

1. custombubbled IPA (50 ml)
2. temperaturecooled back to RT
3. custombubbled IPA (78 ml)
4. additionwere added drop wise simultaneously at RT
5. temperatureThe overall reaction mixture was heated to 50° C.
6. customOn completion of the reaction
7. temperaturecooled
8. customthe reaction contents to rt
9. filtrationfiltered on a silica gel bed
10. washthe bed was washed with ethyl acetate (2×30 ml)
11. concentrationFiltrate was concentrated under reduced pressure, residue
12. additiontreated with charcoal
13. filtrationFiltered the contents over a silica gel bed
14. washthe bed washed with DCM (4×30 ml)
15. distillationDCM was distilled off completely
16. customthe crude obtained
17. customwas purified by column chromatography (silica gel, 20% ethyl acetate/hexane)

ORD record

ord-1c9b510dde224fc48b27a6505efc643b

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08334315B2