98155-24-9

Upstream product

• 64-17-5 ethanol 
• 76343-92-5 (R)-4-((4Z,8E,10Z)-(1R,12S,15R)-5,12-Dimethyl-3-oxo-2,16-dioxa-bicyclo[13.3.1]nonadeca-4,8,10,17-tetraen-17-yl)-thiazolidin-2-one 
• 32315-10-9 bis(trichloromethyl) carbonate 
• 868-59-7 L-cysteine ethyl ester hydrochloride 
• 3411-58-3 L-cystein ethyl ester 
• 530-62-1 1,1'-carbonyldiimidazole 
• 19771-63-2 2-oxothiazolidine-4(R)-carboxylic acid 
• 868-59-7 chlorhydrate du L-cysteinate d'ethyle 
• 124-38-9 carbon dioxide 

Downstream Products

• 98183-20-1 (R)-3-benzyl-2-oxothiazolidine-4-carboxylic acid ethyl ester 
• 101860-50-8 (-)-3-(4-methoxybenzyl)-2-oxo-thiazolidine-4-carboxylic acid ethyl ester 
• 264621-75-2 ethyl (4R)-3-but-3-enyl-2-oxothiazolidine-4-carboxylate 
• 19750-45-9 l-2-oxothiazolidine-4-carboxylic acid 

Relevant academic research and scientific papers

Structure-Activity Studies of Truncated Latrunculin Analogues with Antimalarial Activity

Malarial parasites employ actin dynamics for motility, and any disruption to these dynamics renders the parasites unable to effectively establish infection. Therefore, actin presents a potential target for malarial drug discovery, and naturally occurring actin inhibitors such as latrunculins are a promising starting point. However, the limited availability of the natural product and the laborious route for synthesis of latrunculins have hindered their potential development as drug candidates. In this regard, we recently described novel truncated latrunculins, with superior actin binding potency and selectivity towards P. falciparum actin than the canonical latrunculin B. In this paper, we further explore the truncated latrunculin core to summarize the SAR for inhibition of malaria motility. This study helps further understand the binding pattern of these analogues in order to develop them as drug candidates for malaria.

Origin of the Thiopyrone CTP-431 "unexpectedly" Isolated from the Marine Sponge Cacospongia mycofijiensis

An intriguing hypothesis that latrunculin A, a well-known natural product, might have undergone transformation into the unprecedented thiopyrone CTP-431 upon long-term storage in methanol is advanced. Thus, opening of the hemiacetal of latrunculin A, foll

(R)-[(2-oxo-4-thiazolidinyl)methyl]triphenylphosphonium iodide: A wittig reagent for the synthesis of cysteine-derived alkenes

(R)-[(2-Oxo-4-thiazolidinyl)methyl]triphenylphosphonium iodide (1), readily prepared in five steps from l-cysteine ethyl ester (39% overall on a 500 g scale), is a useful Wittig reagent for the synthesis of cysteine-derived alkenes such as those found in

Carbon dioxide as a carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas: Scope and limitations

Carbon dioxide can be used as a convenient carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas. The transient carbamate anion generated by treating a primary or secondary amine group in basic media can be activated with phosphorylating agents such as Diphenylphosphoryl azide (DPPA) and Diphenyl chlorophosphate (DPPCl) but also with other types of electrophiles such as SOCl2, TsCl, or AcCl. The intramolecular trapping of the activated carbamate by a hydroxyl group leads to the formation of 2-oxazolidinones or 2-oxazinones in good to excellent yields. This methodology was successfully applied to the synthesis of cyclic ureas up to 7-membered rings from the corresponding diamines.

Carbonylation with CO2 and phosphorus electrophiles: A convenient method for the synthesis of 2-oxazolidinones from 1,2-amino alcohols

2-Oxazolidinones were prepared in good yields from 1,2-amino alcohols and CO2 in the presence of tetramethyl-phenylguanidine (PhTMG) as a base and a variety of phosphorus electrophiles under mild conditions. This procedure is advantageous over previous methodologies and relies on a novel carbonylation procedure that utilizes nontoxic CO2 and phosphorus electrophiles. Georg Thieme Verlag Stuttgart.

Total syntheses of the actin-binding macrolides latrunculin A, B, C, M, S and 16-epi-latrunculin B

The latrunculins are highly selective actin-binding marine natural products and as such play an important role as probe molecules for chemical biology. A short, concise and largely catalysis-based approach to this family of bioactive macrolides is presented. Specifically, the macrocyclic skeletons of the targets were forged by ring-closing alkyne metathesis (RCAM) or enyne-yne metathesis of suitable diyne or enyne-yne precursors, respectively. This transformation was best achieved with the aid of [(tBu)(Me2C6H 3)N]3Mo (37) as precatalyst activated in situ with CH 2Cl2, as previously described. This catalyst system is strictly chemoselective for the triple bond and does not affect the olefinic sites of the substrates. Moreover, the molybdenum-based catalyst turned out to be broader in scope than the Schrock alkylidyne complex [(tBuO)3 W≡CMe3] (38), which afforded cycloalkyne 35 in good yield but failed in closely related cases. The required metathesis precursors were assembled in a highly convergent fashion from three building blocks derived from acetoacetate, cysteine. and (+)-citronellene. The key fragment coupling can either be performed via a titanium aldol reaction or, preferentially, by a sequence involving a Horner-Wadsworth-Emmons olefination followed by a protonation/cyclization/diastereoselective hydration cascade. Iron-catalyzed C-C-bond formations were used to prepare the basic building blocks in an efficient manner. This synthesis blueprint gave access to latrunculin B (2), its naturally occurring 16-epimer 3, as well as the even more potent actin binder latrunculin A (1) in excellent overall yields. Because of the sensitivity of the 1,3-diene motif of the latter, however, the judicious choice of protecting groups and the proper phasing of their cleavage was decisive for the success of the total synthesis. Since latrunculin A and B had previously been converted into latrunculin S, C and M, respectively, formal total syntheses of these congeners have also been achieved. Finally, a previously unknown acid-catalyzed degradation pathway of these bioactive natural products is described. The cysteine-derived ketone 18, the tetrahydropyranyl segment 31 serving as the common synthesis platform for the preparation of all naturally occurring latrunculins, as well as the somewhat strained cycloalkyne 35 formed by the RCAM reaction en route to 2 were characterized by X-ray crystallography.

INTERMEDIATE FOR BIOTIN AND PROCESS FOR PRODUCING THE SAME

The present invention is to provide a process for preparing a synthetic intermediate of biotin which is industrially advantageous, and discloses a process for preparing a compound represented by the formula (I) : ???wherein R1 and R2 may be the same or different from each other, and each represents hydrogen atom, a benzyl group which may have a substituent(s) on the benzene ring, a benzhydryl group which may have a substituent(s) on the benzen ring, or a trityl group which may have a substituent(s) on the benzene ring, R3 represents cyano group, carboxyl group, an alkoxycarbonyl group, an alkylthiocarbonyl group, or a carbamoyl group which may have a substituent, or a salt thereof which comprises subjecting a compound represented by the formula (II-a) : ???wherein the symbols have the same meanings as defined above, or a salt thereof to ring transformation.

A practical synthesis of (+)-biotin from L-cysteine

α-Amino aldehyde 4, which is readily derived from L-cysteine through cyclization and elaboration of the carboxy group, was subjected to the Strecker reaction, which, via sodium bisulfite adduct 16, afforded α-amino nitrile 5 with high diastereose-lectivity (syn/anti = 11:1) and in high yield. Amide 6, derived from 5, was converted to thiolactone 8, a key intermediate in the synthesis of (+)-biotin (1), by a novel S,N-carbonyl migration and cyclization reaction. The Fukuyama coupling reaction of 8 with the zinc reagent 21, which has an ester group, in the presence of a heterogeneous Pd/ C catalyst allowed the efficient installation of the 4-carboxybutyl chain to provide 9. Compound 9 was hydrogenated and the protecting groups removed to furnish 1 in 10 steps and in 34 % overall yield from L-cysteine.

OXAZOLIDIN-2-ONE AND THIAZOLIDIN-2-ONE DERIVATIVES FOR USE AS EP4 RECEPTOR AGONISTS IN THE TREATMENT OF GLAUCOMA

This invention relates to compounds of formula (I) which are potent selective agonists of the EP4 subtype of prostaglandin E2 receptors, their use or a formulation thereof in the treatment of glaucoma and other conditions which are related to e

Catalysis-Based Total Synthesis of Latrunculin B

The highly selective actin-binding latrunculins (e.g. 1) play a prominent role as probe molecules in chemical biology. A highly concise, productive, and inherently flexible approach to 1 illustrates the excellent profile and use of metal-catalyzed C-C bond formations.