Expedient Synthesis of the α-C-Glycoside Analogue of the Immunostimulant Galactosylceramide (KRN7000)
摘要:
Key reactions in a concise synthesis of an alpha-C-galactosylceramide analogue of KRN7000 include a diastereoselective alkenylalane addition to an N-tert-butanesulfinyl imine and the use of an epoxidation/carbamate ring opening sequence to install the aminodiol stereotriad.
A new immunostimulant, the 4′-epimer of α-C-GalCer, was synthesized from a C2-symmetric dienediol and α-C-allyl galactoside. The intramolecular aziridination and the following reductive ring opening provided the core of the aliphatic amino alcohol with excellent regio- and stereocontrol. The new immunostimulants 3d and 3e gave a better polarized Th1-type cytokine response in murine NKT cells than the
The synthesized glycerolipid derivatives possessing simple alkyl chains can stimulate a Mincle-mediated signaling assay relevant for the innate immune system.
合成的甘油酯衍生物具有简单的烷基链,可刺激与先天性免疫系统相关的 Mincle 介导的信号检测。
Synthesis of <i>C</i>-Glycoside Analogues of α-Galactosylceramide via Linear Allylic C–H Oxidation and Allyl Cyanate to Isocyanate Rearrangement
作者:Zheng Liu、Robert Bittman
DOI:10.1021/ol2032448
日期:2012.1.20
modifications known to promote Th-1 cytokine production were included. The key transformations include C–H oxidation, Sharpless asymmetric epoxidation, olefin cross metathesis, and an allyl cyanate to isocyanaterearrangement.
Synthesis of truncated analogues of the iNKT cell agonist, α-galactosyl ceramide (KRN7000), and their biological evaluation
作者:Natacha Veerapen、Faye Reddington、Mariolina Salio、Vincenzo Cerundolo、Gurdyal S. Besra
DOI:10.1016/j.bmc.2010.11.032
日期:2011.1
of iNKT cells by α-galactosylceramide (α-GalCer), also known as KRN7000, and its truncated analogue OCH induces both Th1- and Th2-cytokines, with OCH inducing a Th2-cytokine bias. Skewing of the iNKT cells’ response towards either a Th1- or Th2-cytokine profile offers potential therapeutic benefits. The length of both the acyl and the sphingosine chains in α-galactosylceramides is known to influence
RCAI-133, an N-methylated analogue of KRN7000, activates mouse natural killer T cells to produce Th2-biased cytokines
作者:Takuya Tashiro、Tomokuni Shigeura、Masao Shiozaki、Hiroshi Watarai、Masaru Taniguchi、Kenji Mori
DOI:10.1039/c3md00073g
日期:——
We synthesized seven new analogues of KRN7000: RCAI-133 and 154–159. RCAI-154, 156 and 158 are secondary-amide analogues having a hydroxy, a methyl or two methyl groups at the α-position of a linear C18-acyl chain, respectively. RCAI-155, 157 and 159 are corresponding N-methylated tertiary amide analogues, and RCAI-133 is the N-methylated KRN7000. Among them, a PBS solution of RCAI-133 induced mouse lymphocytes to produce Th2-biasing cytokines in vivo, while RCAI-154–159 showed only weak or almost no immunostimulatory activity. Therefore, N-methylation led the glycolipid to produce predominantly Th2-type cytokines, while acyl α-substitution was detrimental to activity.