Generation of hazardous methyl azide and its application to synthesis of a key-intermediate of picarbutrazox, a new potent pesticide in flow
作者:Daisuke Ichinari、Aiichiro Nagaki、Jun-ichi Yoshida
DOI:10.1016/j.bmc.2017.07.005
日期:2017.12
Generation and reactions of methyl azide (MeN3) were successfully performed by using a flow reactor system, demonstrating that the flow method serves as a safe method for handling hazardous explosive methyl azide. The reaction of NaN3 and Me2SO4 in a flow reactor gave a MeN3 solution, which was used for Huisgen reaction with benzoyl cyanide in a flow reactor after minimal washing. The resulting 1-
通过使用流动反应器系统成功地进行了叠氮化甲酯(MeN 3)的生成和反应,表明该流动方法是处理危险的爆炸性叠氮化物的安全方法。NaN 3和Me 2 SO 4在流动反应器中的反应产生了MeN 3溶液,经过最少的洗涤后,该溶液用于在流动反应器中与苯甲酰氰化物进行Huisgen反应。所得的1-甲基-5-苯甲酰基四唑是新型有效农药Picarbutrazox(IX)的关键中间体。
[EN] PROCESS FOR THE PREPARATION OF 5-SUBSTITUTED 1-ALKYLTETRAZOLYL OXIME DERIVATIVES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE 1-ALKYLTÉTRAZOLYL-OXIME SUBSTITUÉS EN 5
申请人:BAYER CROPSCIENCE AG
公开号:WO2012000918A1
公开(公告)日:2012-01-05
The present invention relates to a process for the preparation of 5-substituted 1-alkyltetrazolyl oxime derivatives.
New scaffolds obtained by Paternò-Büchi reactions between heteroaromatic, trifluoromethylphenyl ketone and electron rich or fluorinated alkenes to give corresponding oxetanes. The uncommon regioselectivity with the fluorinated alkenes is explained by the relative stabilities of 1,4-diradical intermediates of this Paternò-Büchi reaction. A metathesis (photo-Wittig reaction) yields amide isosteres.
PROCESS FOR PREPARATION OF 1-ALKYL-5-BENZOYL-1H-TETRAZOLE DERIVATIVES
申请人:Suzumi Tatsumi
公开号:US20120004420A1
公开(公告)日:2012-01-05
The present invention provides a process for preparation of 1-alkyl-5-benzoyl-1H-tetrazole derivative including a step 1 of reacting a ketoamide derivative represented by formula (I) (in formula (I), A represents a halogen atom or the like; n represents an integer of 0 to 5; Y represents an alkyl group) with a halogenating agent to obtain an imidoyl halide derivative represented by formula (II) (in formula (II), A, n and Y are as defined above; X represents a halogen atom); and a step 2 of reacting the imidoyl halide derivative represented by formula (II) with an azide represented by formula (III) (in formula (III), M represents an alkali metal or the like; m represents 1 or 2) to obtain a 1-alkyl-5-benzoyl-1H-tetrazole derivative represented by formula (IV) (in formula (IV), A, n and Y are as defined above).