of 7α-hydroxymethylbicycl4o[3.3.1]- nonan-3-one (1) gave 7β-methylbicyclo[3.3.1]nonan-3 β-ol (2), a product formed as a result of the transannular 1,6-hydride shift enforced by relief of the stenc constraint in the system. Another example of the intramolecular hydride transfer on the same basis was observed in the deketalization of 9,9-disubstituted 7,7-ethylenedioxybicyclo[3.3.1 ]- nonan-3 β-ol (13
SUBSTITUTED BENZIMIDAZOLE-TYPE PIPERIDINE COMPOUNDS AND USES THEREOF
申请人:Shionogi & Co., Ltd.
公开号:US20140187535A1
公开(公告)日:2014-07-03
The disclosure relates to Substituted Benzimidazole-Type Piperidine Compounds of Formula (I):
and pharmaceutically acceptable salts or solvates thereof, e.g., a pharmaceutically acceptable salt or solvate, wherein R
1
, R
2
, R
3
, Q
a
, W, U, A, B, Z, a, and the dashed lines are as defined herein, compositions comprising an effective amount of a Substituted Benzimidazole-Type Piperidine Compound, and methods to treat or prevent a condition, such as pain, comprising administering to an animal in need thereof an effective amount of a Substituted Benzimidazole-Type Piperidine Compound.
Baeyer–Villiger oxidation under Payne epoxidation conditions
作者:Tyne D. Bradley、Andrei Dragan、Nicholas C.O. Tomkinson
DOI:10.1016/j.tet.2015.08.037
日期:2015.10
A novel method for the Baeyer–Villiger oxidation of ketones has been developed and optimized. The transformation involves a transition metal-free activation of hydrogenperoxide under Payne epoxidation conditions. Reaction of a ketone with hydrogenperoxide in the presence of a nitrile under mildly basic reaction conditions leads to the corresponding ester. The transformation has been successfully
Heterogeneous Baeyer–Villiger oxidation of ketones with H2O2/nitrile, using Mg/Al hydrotalcite as catalyst
作者:Rafael Llamas、César Jiménez-Sanchidrián、José Rafael Ruiz
DOI:10.1016/j.tet.2006.11.081
日期:2007.2
scale. We optimized the cyclohexanone/hydrogenperoxide/benzonitrile proportion and used various nitriles, solvents and amounts of catalyst, benzonitrile and methanol proving the most effective nitrile and solvent, respectively, for the intended purpose. The reaction was found to occur to an acceptable extent with other carbonyl compounds as substrates; by exception, α,β-unsaturated carbonyl compounds
Observation of a Stable Carbocation in a Consecutive Criegee Rearrangement with Trifluoroperacetic Acid
作者:Pavel A. Krasutsky、Igor V. Kolomitsyn、Paul Kiprof、Robert M. Carlson、Andrey A. Fokin
DOI:10.1021/jo991745u
日期:2000.6.1
Selective oxidative cleavage-cyclization of adamantane through the bridge carbon was developed in trifluoroperacetic acid (TFPAA). The methyl group in the bridge position was found to be the substituent that directs consecutive oxygen insertion into the cage structure during the course of a Criegee rearrangement. The formation of stable 5-methyl-4,6-dioxabishomoadamant-5-yl cation at -25 degrees C