O-(1-Phenylbutyl)benzyloxyacetaldoxime, a Versatile Reagent for the Asymmetric Synthesis of Protected 1,2-Aminoalcohols and 2-Hydroxymethyl Nitrogen Heterocycles
<i>O</i>-(1-Phenylbutyl)benzyloxyacetaldoxime, a Versatile Reagent for the Asymmetric Synthesis of Protected 1,2-Aminoalcohols and 2-Hydroxymethyl Nitrogen Heterocycles
作者:Christopher J. Moody、Tracey S. Cooper、Alexander S. Larigo、Pierre Laurent、Andrew K. Takle
DOI:10.1055/s-2002-34235
日期:——
Addition of organometallic reagents to O-(1-phenylbutyl)benzyloxyacetaldoxime in the presence of boron trifluoride diethyl etherate is highly diastereoselective; the resulting hydroxylamines are readily converted into protected 1,2-aminoalcohols and 2-hydroxymethyl nitrogen heterocycles, including the iminosugar 1,4-dideoxy-1,4-imino-d-ribitol, in high enantiomeric excess.
Chiral oxime ethers in asymmetric synthesis. O-(1-Phenylbutyl)benzyloxyacetaldoxime, a versatile reagent for the asymmetric synthesis of protected 1,2-aminoalcohols, α-amino acid derivatives, and 2-hydroxymethyl nitrogen heterocycles including iminosugars
作者:Tracey S. Cooper、Alexander S. Larigo、Pierre Laurent、Christopher J. Moody、Andrew K. Takle
DOI:10.1039/b500390c
日期:——
Addition of a range of organolithium and Grignard reagents to (E)-O-(1-phenylbutyl)benzyloxyacetaldoxime 1 in the presence of borontrifluoride diethyl etherate is highly diastereoselective. The resulting hydroxylamines undergo N-O bond cleavage upon treatment with zinc-acetic acid or molybdenum hexacarbonyl to give, after N-protection, protected 1,2-aminoalcohols 3 in high enantiomeric purity. Debenzylation
A general and mild copper-catalyzed three-component synthesis of protected homoallyl amines
作者:Kalyan Kumar Pasunooti、Min Li Leow、Seenuvasan Vedachalam、Bala Kishan Gorityala、Xue-Wei Liu
DOI:10.1016/j.tetlet.2009.04.008
日期:2009.6
A mild and highly efficient copper-catalyzed, one-pot, three-component reaction is developed for the synthesis of homoallyl amines. Reaction of an aldehyde, a carbamate, and allyltrimethylsilane in the presence of 5 mol % Cu(OTf)2 furnishes the corresponding protected homoallylic amines in good to excellent yields.