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
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
Galagher, Peter T.; Hunt, James C. A.; Lightfoot, Andrew P., Journal of the Chemical Society. Perkin transactions I, 1997, # 17, p. 2633 - 2637
作者:Galagher, Peter T.、Hunt, James C. A.、Lightfoot, Andrew P.、Moody, Christopher J.
DOI:——
日期:——
Asymmetric Synthesis of 2-Substituted Piperidines. Synthesis of the Alkaloids (−)-Coniine and (+)-Pseudoconhydrine
作者:Christopher J. Moody、Andrew P. Lightfoot、Peter T. Gallagher
DOI:10.1021/jo9618435
日期:1997.2.1
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.
Synthesis of fluorous azodicarboxylates: towards cleaner Mitsunobu reactions
作者:Adrian P Dobbs、Caroline McGregor-Johnson
DOI:10.1016/s0040-4039(02)00322-2
日期:2002.4
The synthesis of a fluorous analogue of diethyl azodicarboxylate (DEAD) is described and preliminary results for its use in the Mitsunobureaction given. Use of fluorousextraction methods have shown that chromatography is not necessary for reactionpurification.