反应详情

Hydrogen chloride gas was bubbled through a solution of methyl 2-(R)-[(4-tert-butoxycarbonylpiperazine-1-sulfonyl)amino]propionate (3.6 g, 10.7 mmol) [prepared by proceeding as described in Example 2, but substituting 4-(5-chloropyridin-2-yloxy)piperidine and D-valine methyl ester with 1-tert-butoxycarbonyl-1,4-piperazine and D-alamine methyl ester, respectively] in 10% dioxane/methylene chloride (100 ml) for 10 min. The reaction was stirred at RT for 4 h and concentrated in vacuo to give methyl 2-(R)-[(piperazine-1-sulfonyl) amino]propionate (91%) as a white solid that was used without further purification.

1. customprepared
2. concentrationconcentrated in vacuo