A New Modulated Oxidative Ring Cleavage of α-Nitrocycloalkanones by Oxone®: Synthesis of α,ω-Dicarboxylic Acids and α,ω-Dicarboxylic Acid Monomethyl Esters
with aqueous 0.05 M NaOH, at 80 °C, in the presence of cetyltrimethylammonium chloride (CTACl) as a cationic surfactant, produces ω-nitro acids 2 in good yields. Reduction of the latter with HCOONH4/Pd-C, in methanol, at 80 °C affords ω-aminoacids 3. The synthesis of methyl 9-oxodecanoate (8) is also reported.
Herein, we report a new, efficient and sustainable syntheticprotocol for the preparation of ω-nitro esters starting from cyclic 2-nitro ketones. The method involves the use of polymer bound BEMP and provides the target compounds in excellent yields and low process mass intensity and E-factor values.
α-Nitro ketones 7:1 synthesis of conjugated nitrocyclohexenes
作者:Pimchit Dampawan、Walter W. Zajac
DOI:10.1016/s0040-4039(00)86767-2
日期:1982.1
The reduction of 2-nitrocyclohexanones to the 2-nitrocyclohexanols with sodiumborohydride followed by treatment of the β-nitroalcohols with sodium hydride and subsequent acidification of the salts leads to the regioselective synthesis of conjugatednitrocyclohexenes from cyclohexanones.
Asymmetric Inverse-Electron-Demand Hetero-Diels-Alder Reaction for the Construction of Bicyclic Skeletons with Multiple Stereocenters by Using a Bifunctional Organocatalytic Strategy: An Efficient Approach to Chiral Macrolides
作者:Xianxing Jiang、Long Wang、Ming Kai、Liping Zhu、Xiaojun Yao、Rui Wang
DOI:10.1002/chem.201201102
日期:2012.9.3
We have performed the first bifunctional organocatalytichighlyenantioselective inverse‐electron‐demand hetero‐Diels–Alder reaction of cyclic ketones with enones to afford densely functionalized bicyclic skeletons that contain three stereocenters (up 82 % yield, 10:1 d.r., and 97 % ee). Unlike the previous IEDDAR catalytic strategy, this method features a double HOMOdienophile/ LUMOdiene‐activated
Method for preparing aromatic secondary amino compound
申请人:MITSUI TOATSU CHEMICALS, Inc.
公开号:EP0588060A2
公开(公告)日:1994-03-23
[Constitution] A method for preparing diphenylamine from cyclohexanone and aniline by adding dropwise nitrobenzene and cyclohexanone to a reaction system in which a hydrogen transfer catalyst and a sulfur-free polar solvent are present and aniline is being formed from nitrobenzene as a hydrogen acceptor.
[Effect] Diphenylamine can be obtained in a high yield under moderate reaction conditions.