reacts with Na[BArf4] and PCy3, affording the cationic trans-[Ru(CNNOMe)(CO)(PCy3)(PPh3)][BArf4] (5) (92% yield). These robust pincer complexes display remarkably high catalytic activity in the transfer hydrogenation (TH) of lignocellulosic biomass carbonylcompounds, using 2-propanol at reflux in a basic medium (NaOiPr or K2CO3). Thus, furfural, 5-(hydroxymethyl)furfural and Cyrene are reduced to the
The chemistry of spiroacetals. Preparation of a chiral disubstituted lactone derivative; a key intermediate for synthesis of the spiroacetal moieties of the avermectins and milbemycins
作者:Raymond Baker、R. Hugh O. Boyes、D. Mark P. Broom、J. Alastair Devlin、Christopher J. Swain
DOI:10.1039/c39830000829
日期:——
A synthesis of two diprotected (4S, 6S)-4-hydroxy-6-hydroxymethyltetrahydropyran-2-ones has been developed from laevoglucosan; reaction of these lactones with a substituted lithium acetylide derivative followed by hydrogenation and acid catalysed cyclisation has led to formation of the spiroacetalmoiety of milbemycin β1 and β3.
Preparation of the diastereomerically pure 2S-hydroxy derivative of dihydrolevoglucosenone (cyrene)
作者:Bulat T. Sharipov、Anna N. Davydova、Liliya Kh. Faizullina、Farid A. Valeev
DOI:10.1016/j.mencom.2019.03.029
日期:2019.3
Diastereomericallypure levoglucosenone alcohol, synthesized from levoglucosenone, upon hydrogenation on Raney Ni or Pd/BaSO4 undergoes epimerization at C2 atom caused by formation of cyrene by-product and its subsequent non-specific reduction. A microbiological stereospecific technique using baker's yeast (Saccharomyces cerevisiae) has been developed levoglucosenone for cyrene reduction into cyrene
由左葡糖醛酮合成的非对映体纯的左葡糖醇酮醇在阮内镍或Pd / BaSO 4上氢化后,由于形成c副产物及其随后的非特异性还原而在C 2原子上发生差向异构化。已经开发出了使用面包酵母(酿酒酵母)的微生物立体定向技术,用于将c还原为c醇的左葡糖醛酮,并且还用于还原c的4-烷氧基和4-苄氧基衍生物。
Synthesis and fungicidal activity of methylsulfanylmethyl ether derivatives of levoglucosenone
作者:Bulat T. Sharipov、Anna N. Davidova、Alena S. Ryabova、Nailya F. Galimzyanova、Farid A. Valeev
DOI:10.1007/s10593-019-02415-7
日期:2019.1
A series of derivatives were synthesized on the basis of levoglucosenone that contained hydroxy groups at the С-4 atom or С-2 and С-4 atoms or a hydroxy and methyl group at the С-4 atom. In addition, 4-hydroxymethylbutanolides were synthesized. Derivatives containing hydroxy groups were obtained as methylsulfanylmethyl ethers. It was established that compounds containing a 6,8-dioxabicyclo[3.2.1]-octane
Hydrogenation of levoglucosenone to renewable chemicals
作者:Siddarth H. Krishna、Daniel J. McClelland、Quinn A. Rashke、James A. Dumesic、George W. Huber
DOI:10.1039/c6gc03028a
日期:——
We have studied the hydrogenation of levoglucosenone (LGO) to dihydrolevoglucosenone (Cyrene), levoglucosanol (Lgol), and tetrahydrofurandimethanol (THFDM) and elucidated the reaction network over supported palladium catalysts. At low temperature (40[degree]C) over...