• Title/Summary/Keyword: Chlorosulfonyl isocyanate (CSI)

Search Result 7, Processing Time 0.023 seconds

Studies on the Regioselective and Diastereoselective Amination using Chlorosulfonyl Isocyanate (CSI)

  • Kim, In-Su;Jung, Young-Hoon
    • Proceedings of the PSK Conference
    • /
    • 2003.04a
    • /
    • pp.239.2-240
    • /
    • 2003
  • We have recently described the novel synthetic method for N-protected amines from various ethers using chlorosulfonyl isocyanate(CSI) and found that the mechanism of our CSI reaction is a competitive reaction of SN1 and SNi mechanism according to the stability of carbocation intermediate. Forthermore. we developed the regioselective and diastereoselective one-pot synthetic method for 1,2-amino alcohol, through the reaction of di-and tribenzyl thers with CSI, and invetigated its mechanism. (omitted)

  • PDF

Studies on the Regioselective of Chlorosulfonyl Isocyanate with Cyclic ethers

  • Lim, Seung-Yong;Jung, Young-Hoon
    • Proceedings of the PSK Conference
    • /
    • 2003.10b
    • /
    • pp.183.1-183.1
    • /
    • 2003
  • The synthesis of various cyclic carbamate compounds and amino alcohols has attracted attention in the past because of their potential as antibiotics, antitumor, analgenics, anticonvulsants. Several methods for the preparation of cyclic carbamate compounds have previously been reported including the use of heterocumulenes. We have recently described the novel synthetic method for N-protected amines from various ethers using Chlorosulfonyl isocyanate(CSI) and found that the mechanism of our CSI reaction is a competitive reaction of $S_N1$ and $S_ Ni$ mechanisms according to the stability of carbocation intermediates. (omitted)

  • PDF

A Novel Synthetic Methods for $\alpha$-Amino Acids from Allyl Ethers via N-Allylcarbamates

  • jung, Young-Hoon;Kim, Ji-Deuk
    • Archives of Pharmacal Research
    • /
    • v.23 no.6
    • /
    • pp.574-578
    • /
    • 2000
  • Protected $\alpha$-Phenyl glycine 17 and phenylalanine 18 and 19 have been synthesized through an efficient three-step sequence from the corresponding allyl ethers 5, 7, and 10. The key intermediate in this synthesis is the corresponding allylic amines prepared by reaction of allyl ethers with chlorosulfonyl isocyanate.

  • PDF

Diastereoselective Synthesis of Unsaturated 1,4-Amino Alcohols as a Biologically Important Moiety

  • Jung Young Hoon;Kim Ji Duck
    • Archives of Pharmacal Research
    • /
    • v.28 no.4
    • /
    • pp.382-390
    • /
    • 2005
  • chial allylic ethers with a hydroxyl group attached to the $\pi-system$ and chlorosulfonyl isocyanate. The enantioselectivity of the CSI reaction with the chiral allylic and benzylic ethers was examined in various solvents and temperatures. Based on these results, it was proposed that the CSI reaction is a competitive reaction of a $S_{N}i$ (retention) and a $S_{N}1$ mechanism (racemization) according to the stability of the carbocation intermediate. This means that there is a greater proportion of retention with the less stable the carbocation intermediate and vise versa.

Mechanism Studies on the CSI Reaction with Allyl Ethers by Varying p-Substituent

  • Jung, Young-Hoon;Kim, Ji-Duck
    • Archives of Pharmacal Research
    • /
    • v.26 no.9
    • /
    • pp.667-678
    • /
    • 2003
  • We examined the effect of p-substituents in p-substituted cinnamyl methyl ethers and 1-(p-substituted phenyl)allyl methyl ethers with CSI, and confirmed that the CSI reaction of allyl ethers (p-substituted ethers) is a competitive reaction of $S_Ni{\;}and{\;}S_N1$ mechanism according to the stability of the carbocation. And, the only terminal allylic amine was obtained through the migration reaction in thermodynamic reaction condition.

Stereoselective Total Synthesis of (-)-Cytoxazone

  • Kim, Ji-Duck;Hoon, Jung-Young
    • Proceedings of the PSK Conference
    • /
    • 2003.10b
    • /
    • pp.179.2-179.2
    • /
    • 2003
  • We have developed the novel one-pot synthetic method for regioselective and stereoselective N-protected amines through the reaction of various ethers with chlorosulfonyl isocyanate (CSI). Also, we found a novel technique to compare directly the stability of carbocations in the solution phase and established the stability order of the various carbocations. And we reported the cleavage of benzyl and p-methoxybenzyl protecting groups of alcohols and phenols in the presence of other functional groups using CSI. (omitted)

  • PDF

One-pot Synthesis of Cinnamylamines with Various Protecting Groups from Cinnamyl Ethers

  • Jung, Young-Hoon;Kim, Ji-Duck
    • Archives of Pharmacal Research
    • /
    • v.24 no.5
    • /
    • pp.371-376
    • /
    • 2001
  • The reaction of various alkyl cinnamyl ethers with CSI afforded the corresponding cinnamylamines with various protecting groups, such as -NHMoc, -NHiPoc, -NHCbz, -NHPnz, -NHTroc and -NHAloc. In the case of cinnamyl t-butyl ether and cinnamyl p-methoxybenzyl ether, the corresponding cinnamyl carbamates were formed via a different reaction pathway from the above.

  • PDF