摘要:
Described are methods for preparing phenols, benzene carboxylic acids, esters and anhydrides thereof from furanic compounds by reaction with a dienophile, wherein the furanic compounds are reacted with a hydrazine and/or oxime and then reacted with a dienophile.
摘要:
Isotopically labeled formaldehyde (*C§H2O) is prepared from labeled methyl iodide (*C§H3I) by reaction with an oxygen nucleophile having a pendant leaving group. The mild and efficient reaction conditions result in good yields of *C§H2O with little or no *C isotopic dilution. The simple, efficient production of 11CH2O is described. The use of the 11CH2O for the formation of positron emission tomography tracer compounds is described. The reaction can be incorporated into automated equipment available to radiochemistry laboratories. The isotopically labeled formaldehyde can be used in a variety of reactions to provide radiotracer compounds for imaging studies as well as for scintillation counting and autoradiography.
摘要翻译:通过与具有侧基离去基团的亲核试剂反应,由标记的甲基碘(* C 3 H 3 I)制备同位素标记的甲醛(* C 2 H 2 O)。 温和和有效的反应条件导致* C·H 2 O的良好产率,很少或没有* C同位素稀释。 描述了11CH2O的简单有效的生产。 描述了使用11CH2O形成正电子发射断层扫描示踪剂化合物。 该反应可以并入放射化学实验室可用的自动化设备中。 同位素标记的甲醛可用于各种反应,以提供放射性示踪剂化合物用于成像研究以及闪烁计数和放射自显影。
摘要:
This invention relates to novel alpha-substituted α,β-unsaturated E- or Z-aldehydes, or isomer mixture thereof, of the formula (I) in which R1 and R2 may be identical or different and are each H or a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms and R3 and R4 may be identical or different and are each a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms, and R5 may be identical or different and is H or a hydrocarbon, in which the hydrocarbon may have one or more heteroatoms, to the use thereof, and to processes for their preparation. The invention further relates to the preparation of further intermediates for pharmaceuticals and to the preparation of the pharmaceuticals.
摘要:
Isotopically labeled formaldehyde (*C§H2O) is prepared from labeled methyl iodide (*C§H3I) by reaction with an oxygen nucleophile having a pendant leaving group. The mild and efficient reaction conditions result in good yields of *C§H2O with little or no *C isotopic dilution. The simple, efficient production of 11CH2O is described. The use of the 11CH2O for the formation of positron emission tomography tracer compounds is described. The reaction can be incorporated into automated equipment available to radiochemistry laboratories. The isotopically labeled formaldehyde can be used in a variety of reactions to provide radiotracer compounds for imaging studies as well as for scintillation counting and autoradiography.
摘要翻译:通过与具有侧基离去基团的亲核试剂反应,由标记的甲基碘(* C 3 H 3 I)制备同位素标记的甲醛(* C 2 H 2 O)。 温和和有效的反应条件导致* C·H 2 O的良好产率,很少或没有* C同位素稀释。 描述了11CH2O的简单有效的生产。 描述了使用11CH2O形成正电子发射断层扫描示踪剂化合物。 该反应可以并入放射化学实验室可用的自动化设备中。 同位素标记的甲醛可用于各种反应,以提供放射性示踪剂化合物用于成像研究以及闪烁计数和放射自显影。
摘要:
The subject of the invention is the products of formula (I): in which R1, R2, R3, R4, R5 and G are as defined in the description, the dotted lines represent an optional second bond, as well as the addition salts with acids and bases and the esters, their preparation process and the intermediates of this process, their use as medicines and the pharmaceutical compositions containing them.
摘要:
Novel chiral phosphorus compounds of the formula ##STR1## wherein R signifies lower alkyl, R.sup.1 signifies phenyl and R.sup.2 and R.sup.3 signify hydrogen or lower alkoxy,which are suitable in the form of complexes with a metal of Group VIII as catalysts for asymmetric hydrogenations and for enantioselective hydrogen displacements in prochiral allylic systems.
摘要:
The present invention relates to a process for producing an .alpha.,.beta.-unsaturated aldehyde which comprises subjecting an allyl-hexamethylenetetraammonium derivative to hydrolysis in water and an organic solvent homogeneously immiscible with water. The resulting .alpha.,.beta.-unsaturated aldehyde is useful as medicaments, flavorings, etc., or as raw materials for their production.
摘要:
The present process is directed to preparing optically active 2-aryl alkyl aldehydes by various processes through the use of an optically active amine, (-)-2'-amino-3-phenyl propane. The aldehyde formed can then be oxidized to produce the corresponding acid.
摘要:
Disclosed are novel classes of anti-androgen including dihydrophenanthrene derivatives, their method of synthesis and their use in treating disorders associated with excessive androgenic activities.
摘要:
3-Hydroxy-2-cyclobuten-1-one salts of the general formula: ##STR1## wherein R is an ammonium group of the general formula: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are the same or different in meaning and each is a hydrogen atom, a lower alkyl group or a cycloalkyl group or R is an alkali metal atom. The salts according for formula I are obtained by the reaction of pure 3-acetoxy-2-cyclobuten-1-one, or 1,3-cyclobutanedione or a distillation residue of the diketene production containing 3-acetoxy-2-cyclobuten-1-one, with a base. The base can be an amine of the general formula: ##STR3## wherein R.sub.1, R.sub.2, and R.sub.3 have the above-mentioned meaning, or an alkali metal alcoholate or an alkali metal hydroxide. The salts according to formula I are suitable for the production of squaric acid, by their being halogenated in a first step and then being hydrolyzed to squaric acid in a second step.