ZnBr2选择性脱除Boc保护基 |
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该方法操作简单,反应在室温下进行,条件温和,选择性好,在一级胺和二级胺同时存在的情况下可以选择性的脱除二级N-boc,一些对酸比较敏感的基团,烯丙基硅烷,缩醛等都不受影响。 In a tvptcal procedure: 6,7-dimethoxytetrahydroisoquinoline t-butyl carbamate (10 mmol ) in dry , distilled dichloromethane (10 ml) is stirred magnetically with anhydrous ZnBrz5 (20 mmol) under argon at room temperature.The reaction is followed by tlc and generally is complete within four hours. The reaction mixture is filtered over Celite and the filtrate is stripped off of its solvent to get 6,7- dime- thoxy-tetrahydroisoquinoline as hydrobromide. (Water soluble amines are extracted as their hydrobromides and recovered by careful neutralization of the aqueous solution and purified by chromatography) Synthetic Communications 1989, 19,3139-3142 本文地址: https://www.chemrss.com/1166.html 版权声明:本网站发布的内容如果涉及侵权请尽快告知,我们将会在第一时间删除。 |
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