18685-18-2Relevant articles and documents
Chemo-enzymatic route to bridged homolyxofuranosyl-pyrimidines
Kumar, Sandeep,Singla, Harbansh,Maity, Jyotirmoy,Mangla, Priyanka,Prasad, Ashok K.
, (2020)
Synthesis of 2′-O,5′-C-bridged-β-D-homolyxofuranosyl nucleosides U and T have been achieved starting from diacetone-D-glucose in overall yields 55.7 and 57.1%, respectively. Quantitative regioselective monoacetylation of the lone primary hydroxyl group in
A carbohydrate-based approach for the total synthesis of (-)-dinemasone B, (+)-4a-epi-dinemasone B, (-)-7-epi-dinemasone B, and (+)-4a,7-di-epi-dinemasone B
Xue, Xiaochao,Yin, Zhaojun,Meng, Xiangbao,Li, Zhongjun
, p. 9354 - 9365 (2013)
(-)-Dinemasone B was isolated by Krohn and co-workers from a culture of the endophytic fungus Dinemasporium strigosum and has shown promising antimicrobial activity. Described herein is the first total synthesis of (-)-dinemasone B, (+)-4a-epi-dinemasone B, (-)-7-epi-dinemasone B, and (+)-4a,7-di-epi-dinemasone B. Their absolute configurations were also determined. The developed synthesis features a stereoselective reduction of C-glycosidic ketone, lactonization, and E-olefination of aldehyde starting from d-glucose.
Syntheses and complexing ability of α-d-gluco- and α-d-xylofuranoside-based lariat ethers
Rapi, Zsolt,Ozohanics, Oliver,Tóth, Gábor,Bakó, Péter,H?fler, Lajos,Nemcsok, Tamás,Kánya, Nándor,Keglevich, Gy?rgy
, p. 19 - 32 (2016)
Chiral monoaza-15-crown-5 lariat ethers attached to a 1,2-O-isopropylidene-α-d-glucofuranoside unit (10–13), monoaza-16-crown-5 lariat ethers fused to 1,2-O-isopropylidene-α-d-glucofuranoside- (18) and to 1,2-O-isopropylidene-α-d-xylofuranoside units (23 and 24) have been synthesized. The alkali metal- and ammonium picrate extracting ability of these macrocycles was investigated in dichloromethane–water system. In general, the 15-membered macrocycles (10–13) showed, for almost all cations, a more considerable extracting ability, than the 16-membered lariat ethers (18, 23 and 24). Plasticized PVC membrane electrodes (ISEs) were prepared from the α-d-glucofuranoside-based triphenylmetyl (trityl) ether derivative (18), and its potentiometric selectivities and complex formation constants were determined with the segmented sandwich membrane method. Furthermore, the binding affinities of ionophores to different metal ions were also measured by competitive ESI–MS experiments. One of the 1,2-O-isopropylidene-α-d-glucofuranoside-based lariat ethers (13) exhibited a high selectivity for silver ion (Ag+).
Visible-Light-Mediated Oxidative Debenzylation Enables the Use of Benzyl Ethers as Temporary Protecting Groups
Cavedon, Cristian,Sletten, Eric T.,Madani, Amiera,Niemeyer, Olaf,Seeberger, Peter H.,Pieber, Bartholom?us
supporting information, p. 514 - 518 (2021/01/26)
The cleavage of benzyl ethers by catalytic hydrogenolysis or Birch reduction suffers from poor functional group compatibility and limits their use as a protecting group. The visible-light-mediated debenzylation disclosed here renders benzyl ethers temporary protective groups, enabling new orthogonal protection strategies. Using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as a stoichiometric or catalytic photooxidant, benzyl ethers can be cleaved in the presence of azides, alkenes, and alkynes. The reaction time can be reduced from hours to minutes in continuous flow.
Synthesis of Benz-Fused Azoles via C-Heteroatom Coupling Reactions Catalyzed by Cu(I) in the Presence of Glycosyltriazole Ligands
Mishra, Nidhi,Singh, Anoop S.,Agrahari, Anand K.,Singh, Sumit K.,Singh, Mala,Tiwari, Vinod K.
, p. 389 - 399 (2019/05/06)
Glycosyl triazoles are conveniently accessible and contain multiple metal-binding units that may assist in metal-mediated catalysis. Azide derivatives of d-glucose have been converted to their respective aryltriazoles and screened as ligands for the synthesis of 2-substituted benz-fused azoles and benzimidazoquinazolinones by Cu-catalyzed intramolecular Ullmann type C-heteroatom coupling. Good to excellent yields for a variety of benz-fused heterocyles were obtained for this readily accessible catalytic system.
