Total synthesis of (2S,3S,4R)-2-[(2′R)-2-benzoyloxydocosanoylamino]-16-methylheptadecane-1,3,4,-triol 3,4-dibenzoate, a partially protected ceramide part of sponge cerebrosides
eptadecane-1,3,4-triol 3,4-dibenzoate 32, a partially protected ceramide part of a cerebroside from the marine sponge Halichondria japonica, has been synthesized from L-ascorbic acid, and its absolute stereochemistry has been determined. The key steps in the synthesis include the regioselective ring opening of chiral epoxide 5 with a 2-alkyl-2-lithio-1,3-dithiane and the introduction of a hydroxymethylene
Structural and Functional Analysis of Bacterial Sulfonosphingolipids and Rosette‐Inducing Factor 2 (RIF‐2) by Mass Spectrometry‐Guided Isolation and Total Synthesis
作者:Daniel Leichnitz、Chia‐Chi Peng、Luka Raguž、Florentine U. N. Rutaganira、Theresa Jautzus、Lars Regestein、Nicole King、Christine Beemelmanns
DOI:10.1002/chem.202103883
日期:2022.2.7
Similarities across species: MS-guided isolation and the first totalsynthesis of bacterialsulfonosphingolipids allowed bioactivity studies on their rosette-inducing and inhibiting capabilities in Salpingoeca rosetta. The most abundant sulfonosphingolipids inhibited rosetteinducing factor-related activity in a concentration-dependent manner thus suggesting that sulfobacins are likely competing for
A resin composition and uses of the same are provided. The resin composition includes the following components:
(A) a cross-linking agent of the following formula (I):
(B) a polyphenylene ether resin, wherein the terminal ends of the polyphenylene ether resin are independently modified by a substituent with a carbon-carbon double bond; and
(C) a catalyst,
wherein, R
1
in formula (I) is a C
6
to C
16
alkyl or a C
6
to C
16
alkenyl, and the weight ratio of the polyphenylene ether resin (B) to the cross-linking agent (A) ranges from 0.5 to 5.
A resin composition and uses of the same are provided. The resin composition includes the following components:
(A) a cross-linking agent of the following formula (I):
(B) a polyphenylene ether resin, wherein the terminal ends of the polyphenylene ether resin are independently modified by a substituent with a carbon-carbon double bond; and
(C) a catalyst,
wherein, R1 in formula (I) is a C6 to C16 alkyl or a C6 to C16 alkenyl, and the weight ratio of the polyphenylene ether resin (B) to the cross-linking agent (A) ranges from 0.5 to 5.
A facile synthesis of sulfobacin A has been developed starting from (R)-cyclohexylideneglyceraldehyde (11). The key steps in the synthesis are the highly diastereocontrolled allylation of 11 and syn-selective reduction of a ketone derived from 11. The other attractive features are the operational simplicity and the use of inexpensive compounds/reagents. (c) 2007 Elsevier Ltd. All rights reserved.