Effect of Substituents and Stability of Transient Aluminum–Aminals in the Presence of Nucleophiles
摘要:
Disubstituted hydroxylamines are synthesized and used to form aluminum-amide complexes. These reagents mask carbonyl groups in situ via nucleophilic addition. The stability and utility of the aluminum-aminals are presented in the context of selectively controlling nucleophilic addition on substrates with multiple carbonyl groups.
Control of Transient Aluminum–Aminals for Masking and Unmasking Reactive Carbonyl Groups
作者:Francis J. Barrios、Brannon C. Springer、David A. Colby
DOI:10.1021/ol401265a
日期:2013.6.21
dimethylaluminum N,O-dimethylhydroxylamine complex, is effective at masking reactivecarbonylgroups in situ from nucleophilic addition. This reagent allows chemoselective addition of reducing reagents, Grignard reagents, organolithiums, Wittig reagents, and enolates into substrates with multiple carbonylgroups. Moreover, the trapped carbonylgroup, a stable aminal, can be unmasked in situ for additional synthetic