Two approaches to the enantioselective synthesis of (4R)-(−)-4-hydroxymethyl-4-thiobutyro-1,4-lactone
摘要:
Enantiomerically pure (4R)-4-hydroxymethyl-4-thiobutyro-1,4-lactone [(5R)-dihydro-5-(hydroxymethyl)-2(3H)-thiophenone (12)] and derivatives were synthesized by two enantiospecific sequences employing D-ribono-1,4-lactone (1) and L-glutamic acid (6) as chiral templates. The key step in the first approach was the SmI2-promoted 2,3-deoxygenation of a 4-thio-L-lyxono-1,4-lactone derivative, prepared from 1. The other strategy, which starts from 6, involves the (5S)-dihydro-5-(p-tolylsulfonyloxymethyl)-2-(3H)-furanone (8) as chiral precursor. This was converted into a 4,5-thiirane derivative via the corresponding 4,5-epoxide. Regioselective opening of the thiirane ring by acetate followed by O-deacetylation gave 12 (40% overall yield from 8). (C) 2000 Elsevier Science Ltd. All rights reserved.
[EN] HETEROCYCLIC COMPOUNDS AND THEIR USE AS RETINOID-RELATED ORPHAN RECEPTOR (ROR) GAMMA-T INHIBITORS<br/>[FR] COMPOSÉS HÉTÉROCYCLIQUES ET LEUR UTILISATION EN TANT QU'INHIBITEURS GAMMA-T DU RÉCEPTEUR ORPHELIN APPARENTÉ AUX RÉCEPTEURS DES RÉTINOÏDES (ROR) )
申请人:TAKEDA PHARMACEUTICAL
公开号:WO2016002968A1
公开(公告)日:2016-01-07
Provided are heterocyclic compounds having a RORγt inhibitory action represented by the formula (I): wherein each symbol is as defined in the specification, or a salt thereof.
The recently identified dihydro-leukotriene B4 metabolite and its C(12)-epi analogue were prepared by Wittig coupling of segments derived from 2-deoxy--ribose and -glutamic acid.
METHOD FOR SYNTHESIZING A PRECURSOR OF A SINGLE DAIRY-LACTONE ISOMER
申请人:INSTITUT DES SCIENCE ET INDUSTRIES DU VIVANT ET DE L'ENVIRONNEMENT - AGROPARIS TECH
公开号:US20180072693A1
公开(公告)日:2018-03-15
This disclosure provides a method for preparing a precursor of a single dairy-lactone isomer, methods of preparing a single dairy-lactone isomer, and to the organoleptic uses thereof.
这份披露提供了一种制备单一乳酸内酯异构体前体的方法,制备单一乳酸内酯异构体的方法,以及其感官用途。
L'eldanolide, phéromone des glandes alaires de la pyrale de la canne à sucre, eldana saccharina (wlk.): structure et synthèse de ses deux énantiomères
The isolation and structure determination of eldanolide, the wing gland pheromone of the male African Sugar Cane Borer, Eldana saccharina (Wlk.) is described. The absolute configuration was determined as (3S, 4R) by comparison of the CD spectra of the natural pheromone with both synthetic enantiomers.
Synthesis of C1C11 fragment of annonacin: a polyketide acetogenin of Annonaceae
作者:Bruno Figadère、Xavier Franck、André Cavé
DOI:10.1016/0040-4039(95)00083-o
日期:1995.3
tri-isopropylsilyloxy-4-tert-butyldimethylsilyloxy-10-tert-amyloxy-11-undecanoate 1 has been synthesized from L-glutamic acid. This compound is a key intermediate in the total synthesis of annonacin, an acetogenin of Annonaceae.