Selective Heck reaction of aryl bromides with cyclopent-2-en-1-one or cyclohex-2-en-1-one
摘要:
The selective Heck reaction of cyclopent-2-en-1-one or cyclohex-2-en-1-one with aryl bromides gives a simple access to the corresponding 3-arylcycloalk-2-en-1-ones. The choice of the base was found to be crucial to avoid the formation of 3-arylcyclopentanones or 3-arylcyclohexanones as side-products. Using KF as base, DMF as solvent and Pd(OAc)(2) as catalyst, the target products were obtained in moderate to good yields with a variety of aryl bromides. Substituents such as fluoro, trifluoromethyl, acetyl, benzoyl, formyl, ester or nitrile on the aryl bromide are tolerated. Sterically congested aryl bromides or bromopyridines can also be employed. (C) 2008 Elsevier Ltd. All rights reserved.
Compounds of general formula (I) their use as calcium receptor-active compounds for the prophylaxis, treatment or amelioration of physiological disorders or diseases associated with disturbances of CaSR activity, such as hyperparathyroidism, pharmaceutical compositions comprising said compounds, and methods of treating diseases with said compounds.
Selective Heck reaction of aryl bromides with cyclopent-2-en-1-one or cyclohex-2-en-1-one
作者:Yacoub Fall、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2008.11.006
日期:2009.1
The selective Heck reaction of cyclopent-2-en-1-one or cyclohex-2-en-1-one with aryl bromides gives a simple access to the corresponding 3-arylcycloalk-2-en-1-ones. The choice of the base was found to be crucial to avoid the formation of 3-arylcyclopentanones or 3-arylcyclohexanones as side-products. Using KF as base, DMF as solvent and Pd(OAc)(2) as catalyst, the target products were obtained in moderate to good yields with a variety of aryl bromides. Substituents such as fluoro, trifluoromethyl, acetyl, benzoyl, formyl, ester or nitrile on the aryl bromide are tolerated. Sterically congested aryl bromides or bromopyridines can also be employed. (C) 2008 Elsevier Ltd. All rights reserved.
Enantioselective Hydrogenation of Endocyclic Enones: the Solution to a Historical Problem
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The enantioselectivehydrogenation of endocyclic enones has been a historical problem for homogeneous catalysis. We herein report an efficient method to reduce endocyclic enones with molecular hydrogen. Catalyzed by a rhodium/Zhaophos complex, a variety of enones with five‐, six‐ or seven‐member ring were hydrogenated with high enantioselectivity (92%—99% ee). Excellent chemo‐ and enantioselectivity