W(CO) 6 -Catalyzed Oxidative Carbonylation of Primary Amines to N,N‘-Disubstituted Ureas in Single or Biphasic Solvent Systems. Optimization and Functional Group Compatibility Studies
2000; American Chemical Society; Volume: 65; Issue: 17 Linguagem: Inglês
10.1021/jo000364+
ISSN1520-6904
AutoresJennifer E. McCusker, A. Denise Main, Kirsten S. Johnson, Cara A. Grasso, Lisa McElwee‐White,
Tópico(s)Chemical Synthesis and Reactions
ResumoPrimary amines undergo carbonylation to N,N'-disubstituted ureas using W(CO)6 as the catalyst, I2 as the oxidant, and CO as the carbonyl source. Preparation of various N,N'-disubstituted ureas from aliphatic primary amines, RNH2 (R = n-Pr, n-Bu, i-Pr, sec-Bu, or t-Bu), was achieved in good to excellent yields. Studies of functional group compatibility using a series of substituted benzylamines demonstrated broad tolerance of functionality during the carbonylation reaction. Preparation of various N,N'-disubstituted ureas from substituted benzylamines, R-C6H4CH2NH2 (R = H, p-OCH3, p-CO2H, p-CO2Et, p-CH2OH, p-SCH3, p-vinyl, p-Cl, p-Br, m-I, p-NH2, p-NO2, or p-CN), was achieved in good yields. For many substituted benzylamines, yields of ureas were higher when a two-phase CH2Cl2/H2O solvent system was used.
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