Lewis Acid-Catalyzed Addition of Benzophenone Imine to Epoxides Enables the Selective Synthesis and Derivatization of Primary 1,2-Amino Alcohols
作者:John Jin Lim、David C. Leitch
DOI:10.1021/acs.oprd.8b00133
日期:2018.5.18
Benzophenone imine was found to be an effective ammonia surrogate for the selective preparation of primary 1,2-amino alcohols from epoxides, including enantiopure epichlorohydrin, in the presence of catalytic Y(OTf)3. High-throughput screening of 48 Lewis acids quickly identified Y(OTf)3 as an effective mediator of the addition reaction under mild conditions. Following acidic hydrolysis, the primary
发现苯甲酮亚胺是一种有效的氨替代物,用于在催化Y(OTf)3存在下从环氧化物(包括对映体纯环氧氯丙烷)选择性制备伯1,2-氨基醇。高通量筛选48种Lewis酸可快速鉴定Y(OTf)3在温和条件下作为加成反应的有效介体。酸性水解后,伯氨基醇盐析出并分配到水溶液中,而二苯甲酮副产物可通过用乙酸乙酯简单萃取而轻易除去。这些铵盐可以直接受Boc保护,也可以进一步衍生,而无需在Schotten–Baumann型条件下分离形成苯甲酰胺和磺酰胺,三步分离产率高达79%。该方法学已用于制备关键中间体,用于合成具有高对映体纯度的PRMT5抑制剂以及许多其他酰胺和磺酰胺衍生物。