Hydrochloric Acid → HCID 21107059, compound

Temperature

-80 °C

To a stirred solution of n-butyllithium in hexane (42 mL, 1.6 M) under nitrogen at −80° C., was added dry tetrahydrofuran (40 mL). To this was added over a 7 min period a solution of dry acetonitrile (2.8 g, distilled from phosphorus pentoxide) in dry tetrahydrofuran (40 mL). The resulting white suspension was stirred for 1 h at −80° C. After this time, a solution of 3-benzyloxycarbonylamino-1-oxo-1,2,3,4-tetrahydronaphthalene (9.9 g) in dry tetrahydrofuran (40 mL) was added over a 5 min period. Additional tetrahydrofuran (40 mL) was introduced to facilitate stirring. After an additional 10 min at −80° C., the reaction mixture was allowed to slowly warm to room temperature during a 15 min period. Once at room temperature, the reaction mixture was poured into a mixture of ice, concentrated aqueous hydrochloric acid solution (10 mL), and diethyl ether (100 mL). The organic layer was separated, and the aqueous layer was extracted with diethyl ether (50 mL twice). The combined organic layers were washed with water (50 mL twice), dried, and evaporated to yield a residue. The residue was chromatographed on silica gel to obtain the title compound as a mixture of diastereomers (7.5 g).

1. stirringto facilitate stirring
2. waitAfter an additional 10 min at −80° C.
3. temperatureto slowly warm to room temperature during a 15 min period
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted with diethyl ether (50 mL twice)
6. washThe combined organic layers were washed with water (50 mL twice),
7. customdried
8. customevaporated
9. customto yield a residue
10. customThe residue was chromatographed on silica gel

ORD record

ord-de8818309d2f4cd9a144d74102427910

Source dataset

uspto-grants-2007_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07226942B2