Iodine → HCID 12884304, compound

To a stirred solution of 400 ml of 0.5 M bis-(3-methyl-2-butyl)borane in glyme, prepared from sodium borohydride, 2-methyl2-butene, and boronitrifluoride etherate as in Example 107, is added 63.7 g (0.30 moles) of 4-methyl-4-trimethylsilyloxy-1-octyne (Example 125) at -10° C. The solution is stirred at ambient temperature for 2.5 hours, cooled to -10° C., and treated during 30 minutes with 158 g (2.1 moles) of solid trimethylamine oxide with cooling. The mixture is stirred at ambient temperature for 2 hours and then poured into a stirred, ice-cold solution of 15% aqueous sodium hydroxide; the stirred mixture is treated immediately with a solution of 426 g (1.68 moles) of iodine in 1100 ml of tetrahydrofuran, After 4 hours the mixture is extracted with ether. The extract is washed successively with water, aqueous sodium thiosulfate, and brine and dried over magnesium sulfate. The extract is concentrated, and the residue is subjected to chromatography on silica gel with hexane to provide an oil, p.m.r. (CDCl3): δ 1.18 (singlet, 4-CH3 group).

1. temperaturecooled to -10° C.
2. temperaturewith cooling
3. stirringThe mixture is stirred at ambient temperature for 2 hours
4. extractionis extracted with ether
5. washThe extract is washed successively with water, aqueous sodium thiosulfate, and brine
6. dry with materialdried over magnesium sulfate
7. concentrationThe extract is concentrated
8. customto provide an oil, p.m.r

ORD record

ord-5ce2297b15de4492ad40412876ea4030

Source dataset

uspto-grants-1979_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04172839