The PdCl2/R3SiH system for the silylation of nucleosides
摘要:
Convenient syntheses of TIPDS-Cl-2, and TBDMS-Br from the corresponding hydrides were obtained by using catalytic PdCl2 and CCl4 or CH2Br2, respectively. These systems can be successfully applied in tandem procedures for improved silylation Of nucleosides. (C) 1999 Elsevier Science Ltd. All rights reserved.
Provided herein are compounds of Formula (I), or pharmaceutically acceptable salts thereof, pharmaceutical compositions that include a compound described herein (including pharmaceutically acceptable salts of a compound described herein) and methods of synthesizing the same. Also provided herein are methods of treating diseases and/or conditions with a compound of Formula (I), or a pharmaceutically acceptable salt thereof.
Herein, a coupling reaction of enol ethers with silyl ketene imines in the presence of catalytic amounts of InBr3 and Me3SiBr is described. Kinetic studies have revealed that an indium catalyst and Me3SiBr accelerated the coupling process and the regeneration of the catalyst, respectively. Various types of enol ethers and silyl ketene imines are applicable. In addition, a formal synthesis of verapamil
NaNO<sub>2</sub>-Mediated Transformation of Aliphatic Secondary Nitroalkanes into Ketones or Oximes under Neutral, Aqueous Conditions: How the Nitro Derivative Catalyzes Its Own Transformation
investigations strongly suggest that they result from the nucleophilic attack of the nitrite anion on the aci-nitro(nate) form of the secondary nitroalkane. The latter acts in turn as an autocatalyst for itsown transformation by means of the nitrosating species generated in situ from it.
Compounds of the formula I:
or pharmaceutically acceptable salts thereof, wherein m, n, R
1
, R
2
, R
3
, R
4
, R
5
, R
a
and R
b
are as defined herein. Also disclosed are methods of making the compounds and using the compounds for treatment of diseases associated with the P2X7 purinergic receptor.
A <sup>13</sup>C nuclear magnetic resonance study of the reversible substituent migration in several 2-acyl and 2-silyl derivatives of tropolone. Troponoid-IV
作者:D. Ménard、M. St-Jacques、J. F. Bagli
DOI:10.1139/v82-036
日期:1982.2.1
The energy barrier for the reversible substituent migration was determined for a number of 2-acyl and 2-silyl derivatives of tropolone. The energy barrier is found to be dependent on the nature of the migrating group. Asymmetric monosubstitution on the ring shifts the equilibrium in favor of one dynamic isomer. In the two cases studied (3-bromotropolone and 3-bromotropolone acetate) it is found that