to cyclize oor Sjinees
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A key step is the Grewe cyclization that is analogous to the cyclization of reticuline that occurs in morphine biosynthesis.
我 做不到 我 能 行嗎? 太 過 政治 化 了LASER-wikipedia2 LASER-wikipedia2
Provided is a method for preparing 3-O-benzyl-1,2-O-isopropylidene-α-L-furan idose, which comprises: (1) protecting hydroxyl of 3-O-benzyl-1,2-O-isopropylidene-α-D-glucofuranose (III) by benzoyl and methylsulfonyl to obtain 6-O-benzoyl-3-O-benzyl-1,2-O-isopropylidene-5-O-methylsulfonyl-α-D-glucofuranose (V); (2) subjecting the compound (V) to a cyclization reaction under an alkaline condition to obtain 5,6-epoxy-3-O-benzyl-1,2-O-isopropylidene-a-L-furan idose (VI); and (3) subjecting the compound (VI) to a ring-opening reaction to obtain 3-O-benzyl-1,2-O-isopropylidene-α-L-furan idose.
這 都 是 些 什 么?- " 攀登 沖突 之 山! "patents-wipo patents-wipo
Metal-catalyzed cyclization reactions usually require mildly basic conditions, and substrates must be chosen to avoid β-hydride elimination.
你 在 耍 我 吧 ! 看看 , 我的 糖 全? 没 了LASER-wikipedia2 LASER-wikipedia2
However, low concentrations of a radical scavenger establish thermodynamic control and provide access to 6-endo products—not via 6-endo cyclization, but by 5-exo cyclization followed by 3-exo closure and subsequent fragmentation (Dowd-Beckwith rearrangement).
你 那? 两 只 大 狗 只 是 唬人 而已 它? 们 其? 实 挺 乖的LASER-wikipedia2 LASER-wikipedia2
Disclosed are a compound of 6-amino-7-hydroxy-3,4-dihydroquinazolin-4-one (I) which can be used in the preparation of Afatinib and the preparation method thereof, the method comprising the following steps: using 3-amino-4-hydroxy benzoic acid or 3-amino-4-hydroxy benzoate or 3-amino-4-hydroxy benzamide as raw materials to prepare the target compound (I) via nitration, reduction and cyclization reactions successively.
妮 可 絲 一 記 強 球 射向 中場patents-wipo patents-wipo
Revealed in the present invention is a method for preparing Afatinib (I): using 2-nitrile-4-[4-(N,N-dimethylamino)-1-oxo-2-buten-1-yl]amino-5-[(S)- (tetrahydrofuran-3-yl)oxy]aniline (II) and 4-fluoro-3-chloroaniline (III) as starting materials, and respectively performing a condensation and cyclization reaction with N,N-dimethylformamide dimethyl acetal (IV) to prepare Afatinib (I), wherein the method significantly reduces the manufacturing steps of Afatinib and greatly lower the costs.
我?? 为 她 是? 头 儿敦 蒂 先生!patents-wipo patents-wipo
Disclosed is a method for preparing a Rivaroxaban intermediate I, comprising the following step: in a non-protonic solvent, under the effect of lewis acid, performing cyclization reaction on 4-(4-phenyl isocyanate)morpholine-3-ketone(II) and (s)-epoxy compound(III), the reation temperature ranging from 20°C to 160°C, where R is amino replaced by amino protecting group.
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In the biosynthesis of Vancomycin, additional modification domains are present, such as the epimerization (E) domain, which isomerizes the amino acid from one stereochemistry to another, and a thioesterase domain (TE) is used as a catalyst for cyclization and releases of the molecule via a thioesterase scission.
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8 sinne gevind in 2 ms. Hulle kom uit baie bronne en word nie nagegaan nie.