A new Knoevenagel-type synthesis of fully substituted γ-hydroxybutenolides
摘要:
The synthesis of fully substituted gamma-hydroxybutenolides is possible by a Knoevenagel-type ring condensation of alpha-methyleneketones and alpha-ketoesters under basic conditions. This novel transformation allowed the preparation of di-aryl/heteroaryl substituted hydroxyfuranones, such as 20 and 27, which are important intermediates for pyridazine fungicides. As it turned out, a whole range of different substituents, such as alkyl, cycloalkyl, aryl, heteroaryl and ester groups could be linked to the butenolide scaffold, demonstrating the broad scope of the novel cyclization. (C) 2012 Elsevier Ltd. All rights reserved.
A new Knoevenagel-type synthesis of fully substituted γ-hydroxybutenolides
摘要:
The synthesis of fully substituted gamma-hydroxybutenolides is possible by a Knoevenagel-type ring condensation of alpha-methyleneketones and alpha-ketoesters under basic conditions. This novel transformation allowed the preparation of di-aryl/heteroaryl substituted hydroxyfuranones, such as 20 and 27, which are important intermediates for pyridazine fungicides. As it turned out, a whole range of different substituents, such as alkyl, cycloalkyl, aryl, heteroaryl and ester groups could be linked to the butenolide scaffold, demonstrating the broad scope of the novel cyclization. (C) 2012 Elsevier Ltd. All rights reserved.
O-benzyl oxime ether derivatives and their use in crop protection compositions
申请人:Bayer Aktiengesellschaft
公开号:US06319925B1
公开(公告)日:2001-11-20
Oxime ethers of formula (I) in which a) X is an N atom and Y is an oxygen atom or NH, or b) X is CH and Y is an oxygen atom, in which furthermore R1 is C1-C4alkyl; R2 is hydrogen, C1-C4alkyl or cyclopropyl; and in which R3 and R4 are as defined herein, are fungicidal, acaricidal and insecticidal active ingredients for agriculture. They can be employed as formulated crop protection compositions.
O-BENZYL OXIME ETHER DERIVATIVES AND THEIR USE IN CROP PROTECTION COMPOSITIONS
申请人:Novartis AG
公开号:EP0848701A1
公开(公告)日:1998-06-24
US6319925B1
申请人:——
公开号:US6319925B1
公开(公告)日:2001-11-20
[EN] O-BENZYL OXIME ETHER DERIVATIVES AND THEIR USE IN CROP PROTECTION COMPOSITIONS<br/>[FR] DERIVES D'ETHER D'OXIME O-BENZYLIQUE ET LEUR UTILISATION DANS DES COMPOSITIONS ANTIPARASITAIRES A USAGE AGRICOLE
申请人:NOVARTIS AG
公开号:WO1997001530A1
公开(公告)日:1997-01-16
(EN) Oxime ethers of formula (I) in which a) X is an N atom and Y is an oxygen atom or NH, or b) X is CH and Y is an oxygen atom, in which furthermore R1 is C1-C4alkyl; R2 is hydrogen, C1-C4alkyl or cyclopropyl; and in which R3 and R4 are as defined herein, are fungicidal, acaricidal and insecticidal active ingredients for agriculture. They can be employed as formulated crop protection compositions.(FR) L'invention concerne des éthers d'oxime de formule (I), dans laquelle a) X est un atome N et Y un atome d'hydrogène ou de NH, ou b) X représente CH et Y est un atome d'oxygène; R1 représente alkyle C1-C4; R2 représente hydrogène, cylcopropyle ou alkyle C1-C4; et R3 et R4 sont tels que définis dans le dossier, et sont des ingrédients actifs fongicides, acaricides et insecticides à usage agricole. Ils peuvent être utilisés en tant que compositions antiparasitaires à usage agricole préparées.
A new Knoevenagel-type synthesis of fully substituted γ-hydroxybutenolides
The synthesis of fully substituted gamma-hydroxybutenolides is possible by a Knoevenagel-type ring condensation of alpha-methyleneketones and alpha-ketoesters under basic conditions. This novel transformation allowed the preparation of di-aryl/heteroaryl substituted hydroxyfuranones, such as 20 and 27, which are important intermediates for pyridazine fungicides. As it turned out, a whole range of different substituents, such as alkyl, cycloalkyl, aryl, heteroaryl and ester groups could be linked to the butenolide scaffold, demonstrating the broad scope of the novel cyclization. (C) 2012 Elsevier Ltd. All rights reserved.