Construction of a Protoberberine Alkaloid Skeleton via the Palladium-Catalyzed α-Arylation–Amide Formation Cascade
作者:Shaofeng Li、Hanyu Nie、Mengyan Duan、Wenfei Wang、Congjun Zhu、Chuanjun Song
DOI:10.1021/acs.orglett.1c03871
日期:2021.12.17
strategy of one-pot synthesis of protoberberine alkaloid derivativesvia palladium-catalyzed cascade α-arylation and cyclization, which can afford the target molecules in moderate to excellent isolated yields using commercially available raw materials under solvent-free conditions. This protocol provides an efficient and convenient path to multisubstituted protoberberine derivatives. In addition, it can
Biosynthesis of Benzo[c]phenanthridine Alkaloids Sanguinarine, Chelirubine and Macarpine
作者:Narao Takao、Miyoko Kamigauchi、Momoyo Okada
DOI:10.1002/hlca.19830660208
日期:1983.3.16
The biosynthesis of the benzo[c]phenanthridinealkaloids was investigated in a cell suspension culture of Macleaya cordata (papaveraceae). Feeding experiments define the biosynthetic pathway (–)-7,8,13,13a-tetrahydrocoptisine (–)-cis-N-methyl-7,8,13,13a-tetrahydrocoptisinium salt 15 protopine (5) sanguinarine (1) chelirubine (3) macarpine (4).
Reduktionen quartärer cyclischer Ammoniumsalze mit Lithiumaluminiumhydrid
作者:H. Schmid、P. Karrer
DOI:10.1002/hlca.19490320340
日期:——
Es wird gezeigt, dass sich quartäre cyclische Ammoniumsalze, die sich vom Chinolin oder Isochinolin als Grundkörper ableiten, durchLithiumaluminiumhydrid zu o-Dihydroderivaten reduzieren lassen. Diese Methode hat manchmal, gegenüber der klassischen Reduktionsmethode derartiger Verbindungen mit Natriumdithionit, gewisse Vorteile.
Es wird gezeigt,Dss sichquartäreCyclische Ammoniumsalze,Chinolin oder Isochinolin alsGrundkörper能力,Durch锂铝氢化物zu o-Dihydroderivaten reduzieren lassen。Diese Methode帽子,Gegenüberder klassischen Reduktionsmethode derartiger Verbindungen mit Natriumdithionit,Gewisse Vorteile。
8,13a-Propanoberbines. III. Reaction of acetoneberberine type enamine with alkyl halide.
The reaction of acetoneberberine (I) with methyl iodide was found to give 8, 13a-(2'-oxopropano)-13, 13-dimethylberbine derivative (IV) and 8, 13a-(2'-oxopropano)-13-methylberbine derivative (V) as side products together with the expected 13-methyl-berberinium (II) and berberinium iodide (III). Analogous reaction of I with allyl bromide gave rise to 8, 13a-(2'-oxopropano)-13, 13-diallylberbine derivative (XI). The structures of products were deduced from chemical and spectral data.
Raman, infrared, or Raman-Infrared analysis of peripheral blood plasma protein structure and its relation to cognitive development in Alzheimer's disease
申请人:Consejo Superior De Investigaciones Científicas
(CSIC)
公开号:EP2700933A1
公开(公告)日:2014-02-26
The present invention relates to a Raman spectroscopy method for determining protein structure associated with global cognitive deterioration in Alzheimer's disease from the Raman spectroscopic analysis of a human blood sample, preferably of a human blood plasma sample, comprising obtaining at least one spectral value of at least one of the Raman spectrum regions comprised between 1600-1700 cm-1, between 910-980 cm-1, between 730-760 cm-1 and/or between 390-450 cm-1, and where said spectral value allows obtaining an indication of the presence or absence of protein structure associated with a condition of Alzheimer's disease. The present invention also relates to a method for the infrared spectroscopic analysis of a blood sample, by means of additionally obtaining at least one spectral value of at least one of the infrared spectrum regions comprised between 1600 and 1700 cm-1 and/or between 1000 and 1150 cm-1. Optionally, the Raman spectroscopy method further comprises the infrared spectroscopic analysis of the same blood sample. The invention also relates to a diagnostic method for diagnosing Alzheimer's disease comprising measuring a Raman spectrum and/or an infrared spectrum of a plasma sample.