摘要:
A process for the preparation of a compound of general formula (I) which comprises reacting a compound of general formula (II) with a carbonyl compound of the general formula (III): RR6CO, wherein Z represents an electron withdrawing group and R6 represents hydrogen, branched or straight-chained, substituted or unsubstituted C1-18 alkyl, substituted or unsubstituted C5-C12 cycloalkyl, aralkyl or alkaryl and R in formulae (I and III) represents hydrogen, substituted or unsubstituted C1-C8 alkyl, lower alkenyl (C1-C8), alk-(C1-C4)aryl, aralkyl(C1-C4) or aryl, or R together with R6 may form a cyclic ring and R5 in formulae (I and II) represents hydrogen, C1-C18 alkyl, cycloalkyl, aralkyl, alkaryl, aryl or a heterocyclic ring such as a furyl ring, said reaction being carried out in the presence of microwave radiation.
摘要:
Substd. terpenes of formula (I) are new. In (I) R = CH=CHCHR1CH(CH3)2 (gp. a), CH2CHR2COR3 (gp. b) or CH2CH2C(OH)(R4)CH3 (gp. c); R1 = CN or CHO; R2 = H or CO2R3; R3 = 1-4C alkyl; R4 = C=CH or CH=CH2; X = H, OH, halo, OR5 or OSO2R6; R5 = H, 1-alkoxyalkyl, tetrahydrofuryl, tetrahydropyranyl, acyl or silyl substd. by 1-5C alkyl or phenyl; R6 = 1-4C alkyl opt. substd. by halo or phenyl opt. substd. by 1-4C alkyl; n = 0-2; provided that (i) when R = a gp. (b) or (c) the X = OR5 and n = O; (ii) when when R1 = CHO the X is not halo or OSO2R6; (iii) when R5 = H then R2 is not H; (iv) when R5 = 1-ethoxyethyl then R3 is not Me.
摘要:
The present invention relates to the field of organic synthesis and describes the synthesis of specific intermediates suitable for the preparation of triazolopyrimidine compounds such as ticagrelor.
摘要:
This invention relates to novel electron deficient olefins, such as certain 2-cyanoacrylates and methylidene malonates, prepared using an imine or an iminium salt.
摘要:
The present invention relates to a specific oxime derivative of formula (I) or its salts and herbicidal compositions containing the same. The oxime derivatives according to the present invention show excellent herbicidal effect against broad leaved weeds and narrow leaved weeds, and additionaly, have quick acting herbicidal activity with reduced application. In formula (I), X, Y, Z, R?1, R2, R3¿ and Q are as defined in claim 1.
摘要:
The present invention relates to a method for the preparation of 3-substituted-3’-hydroxypropionitrile, more particularly, to a method for the preparation of 3-substituted-3’-hydroxypropionitrile which comprises performing ring opening of 1-substituted-ethylene oxide using sodium cyanide and citric acid in a range of pH 7.8 ~ 8.3 to provide 3-substituted-3’-hydroxypropionitrile in high optical purity and with high yield.
摘要:
The present invention relates to a process for preparing 4-chloro-3-hydroxybutanoic acid ester, an intermediate for preparing atorvastatin, in high purity and yield, by comprising the steps of 1) reacting epichlorohydrin of formula (2) with cyanide of formula (3) under the condition of pH ranging from 7 to 8, to form the 4-chloro-3-hydroxybutyronitrile of formula (4) and 2a) dissolving the 4-chloro-3-hydroxybutyronitrile of formula (4) in an alcoholic solvent and reacting it with hydrogen chloride, or 2b) reacting the 4-chloro-3-hydroxybutyronitrile of formula (4) in an alcoholic solvent saturated with hydrogen chloride, to form the 4-chloro-3-hydroxybutyronitrile acid ester of formula (I).
摘要:
A process for cyanating an aldehyde is provided. The process comprises reacting the aldehyde with: i) a cyanide source which does not comprise a Si-CN bond or a C-(C=O)-CN moiety; and ii) a substrate susceptible to nucleophilic attack not comprising a halogen leaving group; in the presence of a chiral catalyst. Preferably, the chiral catalyst is a chiral vanadium or titanium catalyst. The cyanide source is preferably an alkali metal cyanide and the substrate susceptible to nucleophilic attack not comprising a halogen leaving group is a carboxylic anhydride.