摘要:
The present invention relates to a process for the preparation of alkyl esters of (S)-2-amino-5-cyclopropyl-4,4-difluoropentanoic acid, which are intermediates useful in the synthesis of (S)-N-(1-cyanocyclopropyl)-5-cyclopropyl-4,4-difluoro-2-(S)-2,2,2-trifluoro-1-(4-fluorophenyl)ethylamino)pentanamide and related compounds, which are compounds that are cysteine protease inhibitors.
摘要:
A photoresist monomer having a sulfonyl group, a polymer thereof and a photoresist composition containing the same are disclosed. The photoresist monomer is represented by following Formula. wherein, R* is a hydrogen atom or a methyl group, R1 and R2 are independently a C1˜C20 alkyl group, a C4˜C20 cycloalkyl group, a C6˜C20 aryl group or a C7˜C20 arylalkyl group, one of R1 and R2 may not exist, and R1 and R2 can be connected to form a ring.
摘要:
In an illustrative embodiment, the present invention describes the synthesis of the following compound and similar compounds, in high stereochemical purity by a novel stereoselective alkylation process:
摘要:
A process for easily producing various optically active chroman derivatives that are useful as pharmaceutical intermediates from inexpensive starting materials is provided. Cyclic hemiacetal (1) obtained from dihydrocoumarin through one step is asymmetrically reduced to produce an optically active halohydrin derivative (3), and the optically active halohydrin derivative (3) is cyclized to produce an optically active chroman derivative (13):
摘要:
A compound is disclosed having the formula (I), in which m equals 1 to 1000; x equals 0 to 4; W is a group of formulas --CH.sub.2 --CH.sub.2 --, --CH(CH.sub.3)CH.sub.2 -- or --CH.sub.2 CH(CH.sub.3)--; R is hydrogen, a straight-chain or branched-chain C.sub.1 -C.sub.5 alkyl radical; or a group of formulas (a) or (b), in which a, b, c, d and e independently represent a number from 0 to 1000, at least one of the numbers represented by a, b, c, d and e being higher than 0; R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9 are the same or different and represent hydrogen, C.sub.1 -C.sub.5 alkyl or a group of formula (c); R.sup.1 and R.sup.2 are the same or different and represent a straight-chain, a branched-chain or a cyclic C.sub.1 -C.sub.30 alkyl radical or C.sub.6 -C.sub.10 aryl radical which is non-substituted or substituted by one to five C.sub.1 -C.sub.3 alkyl radicals, or R.sup.1 and R.sup.2 form together with the trivalent P atom form a dibenzophospholyl of formula (d) or a 3,4-dimethylphospholyl of formula (e); and L stands for C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy, NO.sub.2, NR.sup.3 R.sup.4, R.sup.3 and R.sup.4 independently representing hydrogen or C.sub.1 -C.sub.4 alkyl, or for Cl or OH. ##STR1##
摘要:
The present invention provides for process of preparing a photoactive ester compound of high purity using a solid base catalyst, preferably an anionic exchange resin. The invention further provides for preparing and imaging a photosensitive composition comprising such a photoactive compound, a film-forming resin and a solvent composition.
摘要:
The present invention provides for process of preparing a photoactive ester compound of high purity using a solid base catalyst, preferably an anionic exchange resin. The invention further provides for preparing and imaging a photosensitive composition comprising such a photoactive compound, a film-forming resin and a solvent composition.
摘要:
The synthesis of pure enantiomers of 8-chloro-6-sulfonyloxy-octanoic acids and their alkyl esters and of pure enantiomers of 6,8-dichloro-octanoic acid and its alkyl esters as intermediates for the synthesis of the enantiomers of .alpha.-liponic acid as well as a method for converting the two enantiomers of 8-chloro-6-hydroxy-octanoic acid into an enantiomer of .alpha.-liponic acid.
摘要:
The alkylsulphate pastes disclosed can be prepared by sulphonating mixtures containing a)50-90% by weight of at least one aliphatic primary alcohol with 6-22 carbon atoms and b)1-50% by weight of at least one unsaturated fatty acid glyceride ester derived from fatty acids having 16-22 carbon atoms and having one, two or three double bonds, with gaseous sulphur trioxide and subsequently neutralizing and hydrolysing the reaction products with aqueous bases in such a way that pastes with solids contents of 30-80% by weight are obtained.