cas 357-57-3, 10,11-Dimethoxystrychnine | Articles data

Articles about 357-57-3Total 8 be found

Lewis acid-promoted electron transfer deoxygenation of epoxides, sulfoxides, and amine N-oxides: the role of low-valent niobium complexes from NbCl5 and Zn
A mild and operationally simple deoxygenation of epoxides, sulfoxides, and amine N-oxides is described using a sub-stoichiometric amount of low-valent niobium complexes generated in situ from commercially available NbCl5 and zinc dust. The deoxygenation proceeds by a reductive cleavage of polarized O-C/O-N/O-S bonds through a single electron transfer from zinc metal to the niobium-substrate complex due to the high oxophilic nature of the niobium species. The presence of adjacent radical-stabilizing groups is beneficial to epoxide substrates; however the similar prerequisite does not apply to sulfoxides and amine N-oxides, where a broad range of substrates are efficiently deoxygenated in excellent yields.
Oh, Kyungsoo,Knabe, William Eric
experimental part
p. 2966 - 2974
(2009/05/30)

SUBSTITUTED QUINOXALYL-IMIDAZOLIDINE-2,4-DIONES, PROCESSES FOR THEIR PREPARATION, THEIR USE AS MEDICAMENTS AND PHARMACEUTICALPREPARATIONS
Substituted quinoxalyl-imidazolidine-2,4-diones, processes for their preparation, their use as medicaments and pharmaceutical preparations 5-Quinoxalyl-imidazolidine-2,4-diones of the formula in which R 1, R 2, R 3, R 4 and R 5 have the meanings given, and physiologically tolerated salts thereof and processes for their preparation are described. The compounds inhibit aldose reductase and can be used as medicaments.
-
(2008/06/13)

Application of Host-Guest Complexation Method to Isolation of Natural Product
Application of host-guest complexation method to isolation of caffeine, nicotine, and cholesterol fom tea and tabaco leaves, and gallstone, respectively, has been reported.Separations of strychnine and brucine, and sparteine and brucine by the same method were also reported.
Segawa, Mari,Mori, Koji,Toda, Fumio
p. 1755 - 1758
(2007/10/02)

Mild Selective Deoxygenation of Amine Oxides by Tin-Tin Bonded Derivatives
A new method of deoxygenation of amine oxides with tin reagent is proposed.It utilizes the reductive properties of the tin-tin bond in hexabutyldistannane or 1,2-dichlorotetrabutyldistannane.Oxides of tertiary amines are reduced into amines by hexabutyldistannane in high yields, whereas pyridine N-oxides react cleanly with 1,2-dichlorotetrabutyldistannane to give the corresponding pyridines.These reactions occur under mild conditions and are very selective.
Jousseaume, Bernard,Chanson, Evelyne
p. 55 - 56
(2007/10/02)

Substituted dodecahydrotriphenylenes, decahydro-1H-cyclopenta[1]phenanthrenes, decahydro-1H-pyrido[1,2-f]phenanthridines and decahydropyrrolo[1,2-f]phenanthridines as CNS agents
1,2,3,4,4a,4b,5,6,7,8,8a,12b-Dodecahydro-7-(oxo, hydroxy or amino)-9-hydroxy-11-(alkyl, alkoxy or alkoxyalkyl)triphenylenes, 2,3,3a,3b,4,5,6,7,7a,11b-decahydro-6-(oxo, hydroxy or amino)-8-hydroxy-10-(alkyl, alkoxy or alkoxyalkyl)-1H-cyclopenta[1]phenanthrenes, 2,3,4,4a,4b,5,6,7,8,8a-decahydro-7-(oxo, hydroxy or amino)-9-hydroxy-11-(alkyl, alkoxy, alkoxyalkyl, aralkyl, aralkoxy, aryloxyalkyl or aralkoxyalkyl)-1H-pyrido[1,2-f]phenanthridines, and 1,2,3,3a,3b,4,5,6,7,7a-decahydro-6-(oxo, hydroxy or amino)-8-hydroxy-10-(alkyl, alkoxy or alkoxyalkyl)pyrrolo[1,2-f]phenanthridines and derivatives are valuable as central nervous system active agents or as intermediates to compounds having such activity.
-
(2008/06/13)

Substituted hexahydropyrrolo[1,2-a]-quinolines, hexahydro-1H-pyrido[1,2-a]-q
Tricyclic benzo fused compounds of the formula STR1 and pharmaceutically acceptable cationic and acid addition salts thereof, wherein n is zero, 1 or 2, and t is 1 or 2; M is CH or N, R1 is H or certain acyl groups; Q is CO2 R4, COR5, C(OR7)R5 R6, CN, CONR9 R10, CH2 NR9 R10, CH2 NHCOR11, CH2 NHSO2 R12, 5-tetrazolyl or when n is 1, Q and OR1 together form a lactone or certain reduced derivatives thereof; and Z is certain alkyl, alkoxy, alkoxyalkyl, aralkyl, aralkoxy, aryloxyalkyl or aralkoxyalkyl groups, are valuable central nervous system active agents, methods for their use, pharmaceutical compositions containing them and certain intermediates therefor.
-
(2008/06/13)

Resolution of racemic 5-phenyl-2-pentanol
Resolution of racemic 5-phenyl-2-pentanol via the hemiphthalate ester, followed by diastereomer salt formation with (+)-brucine, separation of the brucine salt of (S)-5-phenyl-2-pentanol hemiphthalate and recovery of the (S)-alcohol therefrom. The (S)-5-phenyl-2-pentanol is a valuable intermediate for organic synthesis.
-
(2008/06/13)