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35 results about "Intramolecular reaction" patented technology

Intramolecular in chemistry describes a process or characteristic limited within the structure of a single molecule, a property or phenomenon limited to the extent of a single molecule.

Method for synthesizing 8th-site substituted-3,4,7,8-tetrahydro-2H-oxocin-2-one octatomic ring

The invention discloses a method for synthesizing 8th-site substituted-3,4,7,8-tetrahydro-2H-oxocin-2-one octatomic ring. The synthesis method includes the following steps: performing Grignard reaction on an aldehyde or ketone to obtain an allyl alcohol compound; and performing condensation reaction with 2-(tert-butylsulfonyl)acetic acid to obtain an allyl (tert-butylsulfonyl)acetate compound; performing olefin cross-metathesis reaction under the action of a second generation Grubbs catalyst to obtain a methoxycarbonyl (tert-butylsulfonyl)acetate compound; performing intramolecular reaction byusing anhydrous N,N-dimethylformamide as a solvent in the presence of a catalyst palladium acetate and a ligand triphenylphosphine, so as to produce a 3-tert-butylsulfonyl 8th-site substituted-3,4,7,8-tetrahydro-2H-oxocin-2-one octatomic ring lactone compound; and finally removing tert-butylsulfonyl in a reaction solution of sodium amalgam and acetic acid by taking ethanol as a solvent, so as toobtain 8th-site substituted-3,4,7,8-tetrahydro-2H-oxocin-2-one octatomic ring lactone compound. The yield of the method is high, and a solution with a very dilute reaction concentration is not neededin the synthesis of various substituted octatomic ring lactones through intramolecular catalysis by palladium, so the process conditions are simple and universal.
Owner:YANGZHOU UNIV

Method for preparing 8-hydroxy julolidine and derivative thereof

The invention discloses a method for preparing 8-hydroxy julolidine and a derivative thereof. The method comprises the following steps of: (1) solving 3-aminophenol compound and X(CH2)3Y in an organic solvent S1, adding alkali B1, performing intramolecular reaction, reacting until the 3-aminophenol compound fully converts into an intermediate, and processing after finishing the reaction to obtain an intermediate; and (2) adding the intermediate obtained in the step (1) and alkali B2 into an organic solvent S2, performing intramolecular reaction, and processing until finishing the reaction to obtain the objective product. The method for preparing the 8-hydroxy julolidine and the derivative thereof is simple in steps; by strictly controlling the reaction stages, occurrence of disubstituted side reaction and oxidation side reaction is reduced, and productivity ratio of the objective product is improved; and high-poisonous and high-polluted substrate or reagent is avoided in the whole reaction process, which is suitable for industrialization.
Owner:ZHEJIANG UNIV

Compound having chiral spirobiindane skeleton and preparation method therefor

Chiral spirobiindane skeleton compound and preparation method thereof is disclosed in the present invention. The spirobiindane skeleton compound of the present invention having the structure formula of I or I′; the preparation method for synthesizing the spirobiindane skeleton compound of the present invention comprising the following steps: in the presence of solvent and catalysts, the structure formula compound III reacted through intramolecular Friedel-Crafts reaction to obtain the compound of formula I; the catalyst is a Browsteric acidor Lewis acid. The preparation method of chiral fused spirobiindane skeleton compound of the present invention does not need to adopt chiral starting materials or chiral resolving agents, does not require chiral resolving steps, is simple in method, is simple in post-treatment, and is economic and environment friendly. High product yield, high product optical purity and chemical purity. The catalyst for the asymmetric reaction is obtained from the chiral spirobiindane skeleton ligand of the present invention, under the catalytic reagent of transition metal, the catalyzed hydrogenation reaction can arrive at a remarkable catalytic effect with a product yield of >99%, and a product ee value of up to >99%.
Owner:ZHEJIANG JIUZHOU PHARM CO LTD +1

Preparation method of phenyl sulfide compound

The invention discloses a preparation method of a phenyl sulfide compound, which comprises the following steps: by taking thiophenol and o-diiodobenzene as substrates, reacting in a solvent in the presence of a metal hydride to obtain iodine-containing phenyl sulfide; the iodine-containing phenyl sulfide can be subjected to intramolecular reaction to obtain a phenyl sulfide compound; or the iodine-containing phenyl sulfide can react with other raw materials to obtain the phenyl sulfide compound. The ortho-iodine compound prepared by the invention has great application value, can be further widely converted, can be subjected to coupling reaction with phenylboronic acid, thiophenol, phenylacetylene and the like under the catalysis of Pd to prepare various 2-substituted thiophenol, and has important significance in material science and pharmaceutical synthesis.
Owner:SUZHOU UNIV
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