cas 62240-37-3, 2-(Aminoethyl)-2-methyl-1,3-dioxolane

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Highly Regioselective 5-endo-tet Cyclization of 3,4-Epoxy Amines into 3-Hydroxypyrrolidines Catalyzed by La(OTf)3
Highly regioselective intramolecular aminolysis of 3,4-epoxy amines has been achieved. Key features of this reaction are (1) chemoselective activation of epoxides in the presence of unprotected aliphatic amines in the same molecules by a La(OTf)3 catalyst and (2) excellent regioselectivity for anti-Baldwin 5-endo-tet cyclization. This reaction affords 3-hydroxy-2-alkylpyrrolidines stereospecifically in high yields. DFT calculations revealed that the regioselectivity might be attributed to distortion energies of epoxy amine substrates. The use of this reaction was demonstrated by the first enantioselective synthesis of an antispasmodic agent prifinium bromide.
Hoshino, Yoshihiko,Iwabuchi, Yoshiharu,Kuriyama, Yuse,Sasano, Yusuke,Uesugi, Shun-ichiro,Yamaichi, Aoto
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p. 1961 - 1965
(2021/01/04)

Synthesis method of 5-benzyl-2-tert-butyl-8-oxo-2,5-diazaspiro[3,5]nonanyl-2,5-dicarboxylic acid
The invention relates to a synthesis method of 5-benzyl-2-tert-butyl-8-oxo-2,5-diazaspiro[3,5]nonanyl-2,5-dicarboxylic acid. The technical problem of no industrial synthesis routes is mainly solved. The method comprises the following steps: carrying out a
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Paragraph 0008; 0009

(2017/09/01)

New efficient synthesis of pyrido[2,3-c] and pyrido[3,2-c]coumarin derivatives
Various substituted pyrido[2,3-c] and pyrido[3,2-c]coumarins are efficiently prepared in three steps from 3- and 4-hydroxycoumarins, respectively and protected β-aminoketones.
Pavé, Grégoire,Chalard, Pierre,Viaud-Massuard, Marie-Claude,Troin, Yves,Guillaumet, Gérald
p. 987 - 990
(2007/10/03)

Daphniphyllum Alkaloids. 10. Classical Total Synthesis of Methyl Homodaphniphyllate
Details for the first total synthesis of a Daphniphyllum alkaloid are presented.The synthesis required a total of 15 steps from the known keto acid 4 and followed the course 4 -> 10 -> 11 -> 16 -> 20 -> 24 -> 25 -> 27 -> 29 -> 36 -> 46 -> 47 -> 48 -> 49 -
Heathcock, Clayton H.,Davidsen, Steven K.,Mills, Sander G.,Sanner, Mark A.
p. 2531 - 2544
(2007/10/02)

Chemical Properties

Boiling Point: 178.2 °C at 760 mmHg
Flash Point:63.957 °C
Density: 1.005 g/cm³
Storage Temp.:under inert gas (nitrogen or Argon) at 2–8 °C
Vapor Pressure: 1.001mmHg at 25°C
Refractive Index: 1.442
PKA: 10.33±0.10(Predicted)
PSA: 44.48000
LogP: 0.79850

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Chemical Properties

Boiling Point: 178.2 °C at 760 mmHg

Flash Point:63.957 °C

Density: 1.005 g/cm³

Storage Temp.:under inert gas (nitrogen or Argon) at 2–8 °C

Vapor Pressure: 1.001mmHg at 25°C

Refractive Index: 1.442

PKA: 10.33±0.10(Predicted)

PSA: 44.48000

LogP: 0.79850

Global suppliers and manufacturers of 62240-37-3total 32 suppliers on LookChem

Article Database

62240-37-3

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Chemical Properties

Boiling Point: 178.2 °C at 760 mmHg

Flash Point:63.957 °C

Density: 1.005 g/cm3

Storage Temp.:under inert gas (nitrogen or Argon) at 2–8 °C

Vapor Pressure: 1.001mmHg at 25°C

Refractive Index: 1.442

PKA: 10.33±0.10(Predicted)

PSA: 44.48000

LogP: 0.79850

Global suppliers and manufacturers of 62240-37-3total 32 suppliers on LookChem

Density: 1.005 g/cm³