99315-76-1Relevant articles and documents
Synthesis method of jatrophane type diterpene key intermediate and derivatives thereof
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Paragraph 0112-0113, (2021/02/06)
The invention discloses a synthesis method of a jatrophane type diterpene key intermediate and derivatives thereof. The structural formula of the key intermediate is shown in multiple embodiments of the invention, and the jatrophane type diterpene key int
High-Yielding Diastereoselective syn-Dihydroxylation of Protected HBO: An Access to D-(+)-Ribono-1,4-lactone and 5-O-Protected Analogues
Moreaux, Maxime,Bonneau, Guillaume,Peru, Aurélien,Brunissen, Fanny,Janvier, Marine,Haudrechy, Arnaud,Allais, Florent
, p. 1600 - 1604 (2019/01/14)
A diastereoselective chemoenzymatic synthetic pathway to D-(+)-ribono-1,4-lactone, a versatile chiral sugar derivative widely used for the synthesis of various natural products, has been designed from cellulose-based levoglucosenone (LGO). This route involves a sustainable Baeyer-Villiger oxidation of LGO to produce enantiopure (S)-γ-hydroxymethyl-α,β-butenolide (HBO) that is further functionalized with various protecting groups to provide 5-O-protected γ-hydroxymethyl-α,β-butenolides. The latter then undergo a diastereoselective and high-yielding syn-dihydroxylation of the α,β-unsaturated lactone moiety followed by a deprotection step to give D-(+)-ribono-1,4-lactone. Through this 4-step synthetic route from LGO, D-(+)-ribono-1,4-lactone is obtained with d.r. varying from 82:18 to 97:3 and in overall yields between 32 and 41 % depending on the protecting group used. Moreover, valuable synthetic intermediates 5-O-tert-butyldimethylsilyl-, 5-O-tert-butyldiphenylsilyl- as well as 5-O-benzyl-ribono-1,4-lactones are obtained in 3 steps from LGO in 58, 61 and 40 %, respectively.
NOVEL SUBSTITUTED AMINOTHIAZOLOPYRIMIDINEDIONE FOR THE TREATMENT AND PROPHYLAXIS OF VIRUS INFECTION
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, (2016/11/28)
The present invention relates to compounds of formula (I), wherein R1 to R5 are as described herein, and their prodrugs or pharmaceutically acceptable salt, enantiomer or diastereomer thereof, and compositions including the compounds and methods of using the compounds.