摘要:
A method for preparing a compound of formula (I), wherein R.sub.1 and R.sub.2, which are the same or different, are a hydrogen atom or an alkyl or alkoxy radical, or R.sub.1 and R.sub.2, taken together with the carbon atom to which they are attached, form a cycloalkyl radical containing 3-6 carbon atoms. The method comprises dehalogenating a derivative of formula (lI), wherein R.sub.1 and R.sub.2 have the same meanings as in formula (1) and Hal is a chlorine or bromine atom, using 1-2 mol of triethylammonium formate, in the presence of 0.002-0.1 mol of coal-borne palladium per mol of the compound of formula (II), in aceonitrile or tetrahydrofuran and at a temperature between 50.degree. C. and the boiling point of the reaction medium. ##STR1##
摘要:
Thiazolidine derivatives of formula (I), in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are as defined in the specification. The invention also concerns the salts of these derivatives, the preparation thereof and drugs containing same. ##STR1##
摘要:
Compounds of formula: ##STR1## in which R.sub.1 is (a) a phenyl radical or a substituted phenyl radical, (b) a chain --CH(R.sub.8)--COOR.sub.4, (c) a chain --CH.sub.2 --CO--NR.sub.5 R.sub.6 or (d) a phenylalkyl radical, R.sub.2 is a methylene or ethylene radical or a radical --CH(R.sub.7)--, R.sub.3 is a 1- or 2-naphthyl radical, 2- or 3-indolyl or phenylamino radical in which the phenyl ring is optionally substituted on the understanding that, when R.sub.3 is 1- or 2-naphthyl or 2- or 3-indolyl radical, R.sub.7 cannot represent a benzyl, alkylthioalkyl or phenyl radical, as well as, when R.sub.2 is a radical --CH(R.sub.7)--, their racemates and their stereoisomers, and medicinal products containing them.
摘要:
The present disclosure relates to the dyeing of keratin materials using thiol/disulfide styryl tetrahydroquinolinium fluorescent dyes. Disclosed herein is a dye composition comprising a thiol/disulfide styryl tetrahydroquinolinium fluorescent dye and a dyeing process with, for instance, a lightening effect on keratin materials such as hair, using said composition. Disclosed herein are thiol fluorescent dyes and the uses thereof in lightening keratin materials. This composition can be used to obtain a lightening effect which can be resistant and visible on dark keratin fibers.
摘要:
The invention relates to a process for the diastereoselective preparation of olefins via the Homer-Wadsworth-Emmons reaction, which consists in reacting at low temperature a phosphonate with a carbonyl derivative in the presence of a base in a suitable solvent, characterized in that a tris(polyoxaalkyl)amine sequestering reagent of formula (I): N—[CHR1—CHR2—O—(CHR3—CHR4—O)n—R5]3 (I), wherein: n is an integer between 0 and 10; R1, R2, R3 and R4 may be identical or different, and represent a hydrogen atom or an alkyl radical containing from 1 to 4 carbon atoms; R5 represents a hydrogen atom, an alkyl or cycloalkyl radical containing up to 12 carbon atoms, a phenyl radical or a radical of formula —CμH2μ-Φ, or CmH2m+1-Φ-, with m being an integer between 1 and 12 and Φ being a phenyl radical; is added in an amount that is sufficient to increase the diastereoselectivity of the olefin.
摘要翻译:本发明涉及通过Homer-Wadsworth-Emmons反应非对映选择性制备烯烃的方法,该方法在低温下使膦酸酯与羰基衍生物在碱的存在下在合适的溶剂中反应,其特征在于三 (I)的(多氧烷基)胺螯合试剂:N- [CHR 1 -CH 2,-SO 2 -O-(CHR 3 - (I)其中:n是介于0和...之间的整数,其中,n是0和...之间的整数。 10; R 1,R 2,R 3和R 4可以相同或不同,并且表示氢原子 或含有1至4个碳原子的烷基; R 5表示氢原子,含有至多12个碳原子的烷基或环烷基,苯基或式-CmuH 2 mu-Phi的基团或C m H 2m + 1 -hi-,m是1和12之间的整数,Phi是苯基; 以足以增加烯烃的非对映选择性的量加入。
摘要:
This invention is directed to a functionalized amino resin of formula ##STR1## wherein S is a solid support; R is H or alkyl; A is ##STR2## Y is OH or OCOR.sup.1 ; and R.sup.1 is aliphatic or aromatic which is useful for the solid phase synthesis of amides, peptides and hydroxamic acids.
摘要翻译:本发明涉及下式的官能化氨基树脂,其中+ E,crc S + EE是固体载体; R是H或烷基; A是Y是OH或OCOR1; 并且R1是脂族或芳族的,其可用于酰胺,肽和异羟肟酸的固相合成。
摘要:
Compounds of formula: ##STR1## in which R.sub.1 represents an alkyl radical, R.sub.2 represents a phenyl radical or a chain --(CH.sub.2).sub.m --R.sub.4 in which m is equal to 0, 1 or 2 and R, represents a hydroxyl, alkoxy or amino radical, R.sub.3 represents a hydrogen atom or an alkyl, alkoxy or alkylthio radical and n is equal to 0 or 1, their preparation and medicinal products containing them.
摘要:
A subject-matter of the invention is a composition comprising a) at least one ortho-diphenol derivative, b) at least one specific metal derivative and c) at least one basifying agent, a method for dyeing keratinous fibers by treatment of the said fibers using the ingredients a), b) et c) and the use thereof for dyeing keratinous fibers. This hair dyeing method makes it possible to obtain better colorations which are more uniform, chromatic and lasting and which do not detrimentally affect the cosmetic properties of the keratinous fibers, starting from an extract of ortho-diphenols which are in particular natural.
摘要:
A compound of the formula ##STR1## in which Ra represents an -alk-COOalk' radical, a --CH.sub.2 --PO(Oalk).sub.2 radical, a --CH.dbd.CH--COOalk' radical or a phenyl radical substituted with an alkoxycarbonyl radical.