L-Cysteine methyl ester

The thione is prepared by reaction of L-cysteine methyl ester hydrochloride and CS2 in the presence of N(C2H5)3.1... 

Bacteria (modified) bioaccumulation Carbon powder sorbents modified with L-cysteine methyl ester FIBAN-As (Ion-exchange polymeric fibers impregnated with iron (oxy)(hydr)oxides)... 

The N-alkylation of L-cysteine results from a series of reactions involving the condensation of L-cysteine methyl ester (605) with ethyl iminoacetate (606), followed by A-alkylation of the intermediate 4-methoxycarbonyl-2-methylthiazoline (607). Acid hydrolysis of the thiazolinium salt (608 Scheme 301) then gives (609) (70ACS(B)3129). 

L-Cysteine methyl ester hydrochloride Cysteine, methyl ester, hydrochloride, L- (8) L-Cysteine, methyl ester, hydrochloride (9) (18598-63-5)... 

PEPTIDE SYNTHESIS USING l-(4-CHL0R0PHENYL)-3-(4 -METHYL-l -PIPERAZINYL)-2-PR0PYN-l-0NE AS REAGENT BENZYLOXYCARBONYL-L-ALANYL-L-CYSTEINE METHYL ESTER AND BENZYLOXYCARBONYL-L-ASPARTYL-(tert-BUTYL ESTER)-L-PHENYLALANYL-L-VALINE METHYL ESTER... 

C13H14CI203 ciprofibrate 52214-84-3 25.00 1.2743 2 26136 C13H17N03S N-acetyl-S-benzyl-L-cysteine methyl ester 77549-14-5 25.00 1.1837 2... 

C4-Chiral thiazolidine-2-thiones were prepared by condensation, as, for example, (4/ )-methoxycarbonyl-l,3-thiazolidine-2-thione [(4/ )-MCTT] (I) from L-cysteine methyl ester hydrochloride and carbon disulfide (CSj) in the presence of triethylamine (EtjN) in CH2CI2 at room temperature (Scheme 1) (82TL201 85JOC4072). The (4S)-enantiomer was similarly synthesized by using D-cysteine methyl ester hydrochloride (85CC1419). 

OTC is available by several methods, among them the reactions of phosgene (Ref. 273) or more recently tri-phosgene (Ref. 274), with L-Cysteine or L-Cysteine methyl ester appear the more convenient. 

In addition to complexes with ON donor sets, complexes with bidentate N-donor atoms and other donors have been described. For example, after several solution studies the crystal structure of the bis(L-cysteine methyl ester)oxovanadium(IV) complex showed that the vanadium is coordinated by the amido nitrogens and thiolate sulfurs (128).561 The complexes and reactivity of a series of pyridine-2-thiolate complexes of V(IV, III, and II) have been characterized (129-131).651 The mass spectrometric fragmentation patterns of two of these complexes were investigated and show the formation of six 1 1 complexes and one 1 2 complex in the gas phase.651... 

L-Tyrosine hydrochloride L-Cysteine methyl ester hydrochloride Quinuclidine hydrochloride p-Dichlorobenzene... 

Hara et al. [117] demonstrated an excellent separation of the enantiomers of nine aldoses by GC as their diastereomeric thiazolidine derivatives. The sugars were derivatized with L-cysteine methyl ester (49) and subsequently silylated. This simple derivatization, including the acylation, was carried out in pyridine at 60 C. The rapid reaction of thiols with the carbonyl group of sugars was also exploited by Little [118], who used (-k)-l-phenylethanethiol (50) to form acyclic dithioacetals. 

Procedure [117] Dissolve the sugar (0.04 mM) and L-cysteine methyl ester hydrochloride (0.06 mM) in pyridine (200 /il) and heat at 60 °C for 1 h. Add a suitable silylation reagent, e.g. hexamethyldisilazane/trimethyl-chlorosilane (HMDS/TMCS, 150 fil) and heat at 60 °C for a further 30 min. Centrifuge, and analyse the supernatant by gas chromatography. 

Mass spectrometry has been used to identily complexes formed in the gas phase by reaction of oxyanions and carbanions with 1,3,5-triazine. Spectroscopic studies and DFT calculations on the species formed by reaction of ethylamine with 2,4-dinitrotoluene in DMSO indicate that transfer of a methyl proton rather than nucleophilic attack is the major interaction. Two methods for the detection of 2,4,6-trinitrotoluene (TNT) using fluorescence techniques rely on the formation of its complexes with amines. Also cobalt-doped zinc sulfide quantum dots have been used to interact with complexes formed from TNT and L-cysteine allowing detection of the nitro compound. A complex between 2,4-dinitroanisole and L-cysteine methyl ester has been identified by surface-enhanced Raman spectroscopy. ... 

Chemical Properties.—Alkylation. 3-Alkyl-2-thiazolinium salts are readily accessible by direct quaternization of the appropriate 2-thiazolines. 4-Methoxycarbonyl-2-methyl-2-thiazoline, obtainable from L-cysteine methyl ester, is rapidly A-alkylated by methyl iodide and other reagents (Scheme 11). 

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