Acetic Acid → 1-(4-chloro-2-iodophenyl)-1H-Tetrazole

Temperature

2.5 °C

Alternatively, Intermediate 1B can be prepared as follows. To a cold suspension (0-5° C.) of 4-chloro-2-iodoaniline (10.0 g, 39 5 mmol) and sodium azide (7.95 g, 122 mmol) in trimethyl orthoformate (13.08 mL, 118 mmol) was added acetic acid (150 mL). The resulting clear, slightly brown solution was stirred vigorously at 0-5° C. for 30 min and then warmed to rt. A beige precipitate formed overtime and then redissolved to give a clear brown solution. After 22 h, water (400 mL) was added and the suspension was stirred vigorously for 1 h. The solid was collected by filtration, rinsed with water, air-dried, and dried under vacuum to give 11.16 g (92%) of 1-(4-chloro-2-iodo-phenyl)-1H-tetrazole as a beige solid. MS m/z: 307.0. (M+H)+. A flame-dried tube containing this intermediate (0.250 g, 0.816 mmol) and palladium acetate (0.018 g, 0.082 mmol) was purged with argon for several minutes. Next degassed acetonitrile (3.26 mL) was added followed by the addition of ethyl acrylate (0.133 mL, 1.224 mmol) and triethylamine (0.171 mL, 1.224 mmol). The vessel was sealed with a teflon-coated cap and the orange brown solution was warmed to 85° C. to give a brown suspension. After 21 h, the reaction was stopped and cooled to rt. The reaction was filtered through a 0.45 micron glass microfiber filter (GMF), rinsing with acetonitrile, and the filtrate was concentrated to give a brown residue. Purification by normal phase chromatography gave 0.098 g (43%) of (E)-3-(5-chloro-2-tetrazol-1-yl-phenyl)-acrylic acid ethyl ester as a pale yellow solid. MS m/z: 279.1 (M+H)+ and 281 (M+2+H)+. Saponification as described above gave Intermediate 1B.

1. temperaturewarmed to rt
2. customA beige precipitate formed overtime
3. dissolutionredissolved
4. customto give a clear brown solution
5. waitAfter 22 h
6. stirringthe suspension was stirred vigorously for 1 h
7. filtrationThe solid was collected by filtration
8. washrinsed with water
9. customair-dried
10. customdried under vacuum

ORD record

ord-26b70c22467847e2943512d6084032af

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08324199B2