2-oxo-1,3-oxazolidine-3-sulfonyl chloride

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 5.39 g of H-Lys(Boc)-OtBu hydrochloride (15.9 mmol, 1.0 eq) and 7.1 ml of triethylamine (50.9 mmol, 3.2 eq) in dichloromethane (70 ml) was added to the solution obtained in Example 143d), in such a way that the temperatures did not exceed 10° C. After the addition was complete, the mixture was allowed to reach RT and was stirred for a further 2 h. The reaction mixture was then mixed with 200 ml of 0.2 M hydrochloride acid, and the organic phase was separated off and washed with 100 ml of 0.2 M hydrochloric acid and concentrated. 5.5 g of the desired material were obtained as a colorless oil, which crystallized on standing. did not exceed 10° C After the addition to reach RT the organic phase was separated off washed with 100 ml of 0.2 M hydrochloric acid concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 1.13 ml of 2-bromoethanol (15.9 mmol, 1.0 eq) in dichloromethane (20 ml) was slowly added to a solution of 2.25 g of chlorosulfonyl isocyanate (15.9 mmol, 1.0 eq) in dichloromethane (100 ml) under argon at 0° C. in such a way that the temperature did not exceed 10° C. After the addition was complete, stirring was continued at 0° C. for 30 min. The product obtained in this way was directly reacted further in the next step. did not exceed 10° C After the addition The product obtained in this way was directly reacted further in the next step