Synthesis of cyclopropylsilanols by the Simmons-Smith reaction of alkenylsilanols and lithium alkenylsilanolates
摘要:
Alkenylsilanols and the corresponding lithium silanolates prepared in situ by the reaction of cyclic siloxanes with alkenyllithiums are transformed to the corresponding cyclopropylsilanols under the Simmons-Smith reaction conditions. The obtained cyclopropylsilanols are further converted into the corresponding cyclopropanols by the Tamao oxidation. Copyright (C) 1996 Elsevier Science Ltd
Substituted pteridines for the treatment of inflammatory diseases
申请人:Dollinger Horst
公开号:US20060116370A1
公开(公告)日:2006-06-01
The invention relates to new pteridines which are suitable for the treatment of respiratory or gastrointestinal complaints or diseases, inflammatory diseases of the joints, skin or eyes, diseases of the peripheral or central nervous system or cancers, as well as pharmaceutical compositions which contain these compounds.
Chloro(phenyl)carbene and diphenylcarbene reacted with cyclopropanonehemiacetals, cyclopropanols, and cyclopropanone cyanohydrins to give 4-phenylbutanoic acid derivatives. The mechanism was explained in terms of a homolytic process that the O-H group of cyclopropanols reacted as a formal H donor with carbenes.
Novel pyrrolidine compounds that are potent and selective inhibitors of PDE4, as well as methods of making the same, are disclosed. Use of the compounds in the treatment of inflammatory diseases and other diseases involving elevated levels of cytokines, as well as central nervous system (CNS) disorders, also is disclosed.
Novel pyrrolidine compounds that are potent and selective inhibitors of PDE4, as well as methods of making the same, are disclosed. Use of the compounds in the treatment of inflammatory diseases and other diseases involving elevated levels of cytokines, as well as central nervous system (CNS) disorders, also is disclosed.
Exploiting the enantioselectivity of Baeyer-Villiger monooxygenases via boron oxidation
作者:Patrícia B. Brondani、Hanna Dudek、Joel S. Reis、Marco W. Fraaije、Leandro H. Andrade
DOI:10.1016/j.tetasy.2012.05.004
日期:2012.5
The enantioselective carbon-boron bond oxidation of several chiral boron-containing compounds by Baeyer-Villiger monooxygenases was evaluated. PAMO and M446G PAMO conveniently oxidized 1-phenylethyl boronate into the corresponding 1-(phenyl)ethanol (ee = 82-91%). Cyclopropyl boronic esters were also oxidized but with no enantioselectivity. beta-Boryl carboxylic esters were not oxidized by any BVMOs. (C) 2012 Elsevier Ltd. All rights reserved.