Reductive Coupling of Aldimines to Vicinal Diamines Using Zn Powder in Aqueous Basic Media
作者:Manu P. Dutta、Bipul Baruah、Anima Boruah、Dipak Prajapati、Jagir S. Sandhu
DOI:10.1055/s-1998-1800
日期:1998.8
Reductive coupling of aldimines into vicinal diamines has been performed by the action of zinc powder and 10% sodium hydroxide solution without using any organic solvents at ambient temperature in high yields.
Aziridines-IV Catalytic decomposition of phenyldiazomethane in Schiff's bases
作者:R. Bartnik、G. Mlostoń
DOI:10.1016/s0040-4020(01)83511-0
日期:1984.1
Catalytic decomposition of phenyldiazomethane in Schiff's bases is found to proceed via formation of trans-1,3-dipole (azomethine ylide) as an intermediate product. Depending on the size and quantity of the substituents, the ylide undergoes either cyclization in controtatory sense to cis-aziridine or cycloaddition[2+3]to the C=N bond of imine. The reactivity of double bonds to ylide decreases in the order
发现席夫碱中苯基重氮甲烷的催化分解是通过形成反式-1,3-偶极子(偶氮次甲基叶立德)作为中间产物而进行的。取决于取代基的大小和数量,该叶立德在有争议的意义上经历环化成顺式-氮丙啶或环化[2 + 3]亚胺的C = N键。双键对内酯的反应性以C = C> C = O> C = N的顺序降低。
Method of enantioselective nucleophilic addition reaction of enamide to carbonyl group and synthesis method of optically active alpha-hydroxy-y-keto acid ester and hydroxydiketone
申请人:Kobayashi Shu
公开号:US20070073087A1
公开(公告)日:2007-03-29
A method of an enantioselective nucleophilic addition reaction to carbonyl, which enables an asymmetric synthesis of an optically active α-hydroxy-γ-keto acid ester, an optically active α-hydroxy-γ-amino acid ester, hydroxydiketone compounds, etc. being useful as a raw material or synthesis intermediate for producing a pharmaceutical preparation, an agricultural chemical, a fragrance, a functional polymer or the like. In this method, the nucleophilic addition reaction of enamide compound accompanied by hydroxyl (—OH) formation to carbonyl is carried out in the presence of a chiral catalyst with copper or nickel.
Production method for aminophosphonic acid derivatives
申请人:Kobayashi Shu
公开号:US20070142658A1
公开(公告)日:2007-06-21
To present a reaction system that efficiently catalyzes an enantio selective asymmetric nucleophilic addition reaction of an α-iminophosphonic acid ester. An optically active α-amino-γ-oxophosphonic acid derivative is produced through an asymmetric addition reaction of an α-iminophosphonic acid ester and a nucleophilic agent (for example, a silyl enol ether).