Tetrahydrofuran → HCID 131733397, compound

Participants

Reaction Steps

In reaction 1 of Scheme 1, the compounds of formula A-1 or A-2 are converted to the corresponding compounds of Formula II, wherein f is 1 to 8, or III, respectively, by adding triphosgene to a suspension of C-1 or C-2 and triethylamine in a aprotic solvent, such as tetrahydrofuran. The reaction is stirred at room temperature for a time period between about 5 minutes to about 20 minutes, preferably about 15 minutes, and a small amount of ether was added. The triethylammonium salt generated is filtered off. Separately, sodium hydride is added to a suspension of A-1 or A-2, wherein X is OH or NH, in an aprotic solvent, such as tetrahydrofuran, at 0° C. or room temperature. The reaction is stirred at room temperature for a time period between about 5 minutes to about 20 minutes, preferably about 15 minutes, and the isocyanate tetrahydrofuran/ether solution so formed above is added dropwise. Alternatively, the compounds of Formula II and III may be formed by reacting the compounds of D3 or D4 with A-1 and A-2 in presence of a base such triethylamine and diphenylphosphoryl azide in aprotic solvent such toluene as described in procedure discussed above in reaction 4 of Preparation D.

Provenance & Evidence