Chiral oxime ethers in asymmetric synthesis. Part 4. Asymmetric synthesis of N-protected amines and β-amino acids by the addition of organometallic reagents to ROPHy/SOPHy-derived aldoximes
作者:James C. A. Hunt、Cephas Lloyd、Christopher J. Moody、Alexandra M. Z. Slawin、Andrew K. Takle
DOI:10.1039/a907186e
日期:——
Addition of organolithium or Grignard reagents to (R)- or (S)-O-(1-phenylbutyl)aldehyde oximes 1 in the presence of boron trifluorideâdiethyl ether results in the formation of hydroxylamines 2 in good to excellent diastereoselectivity. Subsequent cleavage of the NâO bond with zincâacetic acidâultrasound, and carbamate formation, gives N-protected amines 3 in good enantiomeric purity (77â100% ee). When allylmagnesium bromide was used as the organometallic reagent, the resulting hydroxylamines were converted into β-amino acid derivatives 4 and γ-amino alcohols 5.
Magnesium Bistrifluoromethanesulfonimide Catalysed Three-Component Synthesis of Protected Homoallylic Amines
作者:Hongshe Wang、Weixing Zhao
DOI:10.3184/174751911x13056175312712
日期:2011.5
A one-pot, three-component reaction of an aldehyde, benzyl carbamate and allyltrimethylsilane in the presence of 3 mol% of magnesium bistrifluoromethanesulfonimide at room temperature has been shown to afford the corresponding protectedhomoallylic amine in high yield.
Magnesium Bistrifluoromethanesulfonimide Catalyzed Three-component Synthesis of Protected Homoallylic Amines
作者:Hongshe Wang、June Zeng
DOI:10.5012/bkcs.2011.32.7.2203
日期:2011.7.20
A mild and efficient procedure has been developed for the one-pot, three-component reaction of aldehydes, benzyl carbamate and allyltrimethylsilane in the presence of 3 mol % of magnesium bistrifluoromethanesulfonimide at room temperature to afford the corresponding protectedhomoallylic amines in high yields.
Iodine as a Very Powerful Catalyst for Three-Component Synthesis of Protected Homoallylic Amines
作者:Prodeep Phukan
DOI:10.1021/jo0498462
日期:2004.5.1
Iodine catalyzes efficiently the three-component condensation of aldehydes, benzyl carbamate, and allyltrimethylsilane to afford the corresponding protectedhomoallylic amines in excellent yields.
Highly efficient three-component synthesis of protected homoallylic amines by bismuth triflate-catalyzed allylation of aldimines
作者:Thierry Ollevier、Tuya Ba
DOI:10.1016/j.tetlet.2003.09.221
日期:2003.12
Bismuthtriflatecatalyzes the allylation of a variety of in situ generated protected aldimines using aldehydes, primary carbamates, and allyltrimethylsilane in a three-component reaction. The reaction proceeds rapidly and affords the corresponding protected homoallylic amine in good yield (up to 86%). Scope and limitations of the aldehyde and carbamate components are reported.