Abstract:
This invention describes a process for the isolation of (-)1-(p-methoxybenzyl)-1, 2,3,4,5,6,7,8- octahydroisoquinoline from a racemic mixture, which involves treating partially resolved mixtures with a formic acid to form a nearly-racemic salt for further resolution.
Abstract:
A commercial scale process for the production of tetrahydroisoquinolines and related heterocyclics by reaction, in mildly acidic conditions, of aryl N-sulfonylethylamines in the presence of suitable Lewis acid, and a compound capable of in situ generation of formaldehyde. The process is further characterized by formaldehyde being generated by the reaction of the Lewis acid upon the formaldehyde generating agent, instead of being present as an initial reactant. The process further avoids the presence of initial water which destroys the Lewis acid before it can act upon the formaldehyde generating agent.
Abstract:
A ruthenium-phosphine complex having a 2,2′ bis(diphenylphosphino)-1,1′ -binapthyl ligand is of the general formula: [RU(R-BINAP)MCl k ] l X m wherein R-BlNAP represents a tertiary phosphine represented by the formula: wherein R represents hydrogen or methyl; M represents Zn, Al, Ti or Sn; X represents N(C₂ H₅)₃ or CH₃CO₂ ; when X represents N(C₂ H ₅)₃, l is 2 and m is 1, and when M represents Zn, k is 4, when M represents Al, k is 5, and when M represents Ti or Sn, k is 6; and when X represents CH₃CO₂ , l is 1 and m is 2, and when M represents Zn, k is 2, when M represents Al, k is 3, and when M represents Ti or Sn, k is 4. 16 specific complexes are exemplified. Synthesis is from Ru₂ Cl₄ (R-BINAP)NC₂ H₅ or Ru(CH₃CO₂)₂ (R-BlNAP), by reaction with the Lewis acid ZnCl ₂, AlCl₃ , TiCl₆ or SnCl to give the desired MCl₃ group at 10-25 °C for 2-20 hours in a solvent, e.g. methylene chloride. Optically active R-BINAP can be used. The complex is an excellent catalyst for asymmetric hydrogenation of enamides with high activity.
Abstract:
The invention is concerned with novel isoquinoline derivatives of the formula wherein R¹ is hydrogen, lower alkyl, lower alkoxy, aryl, aryloxy, aryl-lower alkyl or aryl-lower alkoxy and R² is phenyl or substituted phenyl. These novel isoquinoline derivatives are valuable intermediates in the manufacture of morphinan derivatives.
Abstract:
A ruthenium-phosphine complex having a 2,2′ bis(diphenylphosphino)-1,1′ -binapthyl ligand is of the general formula:
[RU(R-BINAP)MCl k ] l X m
wherein R-BlNAP represents a tertiary phosphine represented by the formula: wherein R represents hydrogen or methyl; M represents Zn, Al, Ti or Sn; X represents N(C₂ H₅)₃ or CH₃CO₂ ; when X represents N(C₂ H ₅)₃, l is 2 and m is 1, and when M represents Zn, k is 4, when M represents Al, k is 5, and when M represents Ti or Sn, k is 6; and when X represents CH₃CO₂ , l is 1 and m is 2, and when M represents Zn, k is 2, when M represents Al, k is 3, and when M represents Ti or Sn, k is 4. 16 specific complexes are exemplified. Synthesis is from Ru₂ Cl₄ (R-BINAP)NC₂ H₅ or Ru(CH₃CO₂)₂ (R-BlNAP), by reaction with the Lewis acid ZnCl ₂, AlCl₃ , TiCl₆ or SnCl to give the desired MCl₃ group at 10-25 °C for 2-20 hours in a solvent, e.g. methylene chloride. Optically active R-BINAP can be used. The complex is an excellent catalyst for asymmetric hydrogenation of enamides with high activity.
Abstract translation:具有2,2分钟双(二苯基膦基)-1,1min - 双乙基配位体的钌 - 膦配合物具有以下通式:[RU(R-BINAP)MClk] 1Xm其中R-BlNAP代表由 式:其中R表示氢或甲基; M表示Zn,Al,Ti或Sn; X表示N(C 2 H 5)3或CH 3 CO 2; 当X表示N(C2H5)3时,l为2,m为1,当M表示Zn时,k为4,当M表示Al时,k为5,当M表示Ti或Sn时,k为6; 当X表示CH3CO2时,l为1,m为2,当M表示Zn时,k为2,当M表示Al时,k为3,当M表示Ti或Sn时,k为4.16的特定配合物 。 通过与路易斯酸ZnCl 2,AlCl 3,TiCl 6或SnCl反应合成来自Ru 2 Cl 4(R-BINAP)NC 2 H 5或Ru(CH 3 CO 2)2(R-BlNAP),在10-25℃下得到所需的MCl 3基团 在溶剂中2-20小时,例如 二氯甲烷。 可以使用光学活性的R-BINAP。 该复合物是具有高活性的烯酰胺的不对称氢化的优异催化剂。
Abstract:
Compounds of structure (I) where Y is OH, X₁ is C₁ - ₄alkoxy, X₂ is C₁ - ₄alkoxy, halogen, CF₃ or C₁ - ₄alkyl, processes for their preparation, compositions containing them and their use as β-adrenergic receptor antagonists.
Abstract:
Dichlormethylat des N,N-4,10-Dioxa-3,11-dioxotridezylen-1, 13-bis-tetrahydropapaverin der allgemeinen Formel I sowie ein Verfahren zu seiner Herstellung.
Abstract:
This invention relates to long duration neuromuscular blocking agents, known examples of which agents have been found to have cardiovascular and other side effects, and seeks to overcome the shortcomings of presently used agents. The compounds of this invention are trans, trans-2,2 1 -(dimethylenebis(carbonyloxy- trimethylene))bis(1,2,3,4-tetrahydro-6,7,8-trimethoxy-2-alkyl-1-(3,4,5-trimethoxybenzyl)isoquinolinium salts. A preferred compound has the following structure:
Abstract:
The present invention provides a compound of formula (I) or its salts or pharmaceutically acceptable derivatives wherein R1, R2, R3, X1, and A are defined herein. The compounds are useful as potassium ion channel inhibitors.