One-pot chemoselective reductive alkylation of nitroarenes: A new general method of synthesis of alkylanilines
作者:Giuseppe Bartoli、Marcella Bosco、Renato Dal Pozzo、Marino Petrini
DOI:10.1016/s0040-4020(01)83464-5
日期:1987.1
A New facile and general synthesis of alkylanilines by one-pot reductive alkylation of nitroarenes is reported. This method is based on the “in situ” reduction by hydrides (LiAlH4 or NaBH4) in the presence of catalytic amounts of PdC, of nitronate adducts arising from the conjugate addition of Grignard reagents to mononitroarenes. LiAlH4 showed to be a more efficient but less selective reducing agent
Reduction of nitronate adducts from RMgX and 1-hethoxy-4-nitronaphthalene to oximes or amines by trivalent phosphorus reagents
作者:G. Bartoli、M. Bosco、G. Cantagalli、R. Dalpozzo
DOI:10.1016/s0040-4020(01)91493-0
日期:1984.1
The reduction of nitronate adducts from 1-methoxy-4-nitronaphthalene and Grignard reagents (CH3 MgX, PhCH2CH2HgX, i-C3H7 MgX, c-C6H11MgX and t-C4H9MgX) with hexamethyl phosphorous triamide and phosphorous trichlorlde is reported. With the former reagent the reaction is chemio and stereoselective and only the E-oxime is recovered being the E-2-alkyl-4-methoxy-1(2H)naphthalenone oximes and the E-2-alkyl-2
用六甲基磷三酰胺和1-甲氧基-4-硝基萘和格氏试剂(CH 3 MgX,PhCH 2 CH 2 HgX,iC 3 H 7 MgX,cC 6 H 11 MgX和tC 4 H 9 MgX)还原亚硝酸盐加合物据报道三氯化磷。使用前一种试剂,该反应是化学和立体选择性的,仅回收了E-肟,即E-2-烷基-4-甲氧基-1(2H)萘酮肟和E-2-烷基-2,3-二氢-肟。分别用NH 4 Cl和HCl淬灭后获得的1,4-萘醌-1-肟。肟的立体化学由Eu(dpm)3引起的LIS值指定上13个2-甲基-4-甲氧基-1-(2H)萘酮肟和2-甲基-2,3-二氢-1,4-萘-1-酮肟的C信号。用三氯化磷将胺完全还原成胺。
Process for producing 4-alkoxyanilines
申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US04625062A1
公开(公告)日:1986-11-25
4-Alkoxyanilines are obtained industrially advantageously by catalytically hydrogenating a nitrobenzene in the presence of a noble metal catalyst in a mixed solvent containing a lower aliphatic alcohol, sulfuric acid, and water or a lower aliphatic carboxylic acid or both to induce hydrogenation and a Bamberger-type rearrangement reaction. The mixed solvent contains at least 10 moles, preferably 30 to 60 moles, of the lower aliphatic alcohol per mole of the nitrobenzene, 1 to 10 moles, preferably 2 to 7 moles, of sulfuric acid per mole of the nitrobenzene, and 2 to 30% by weight, preferably 3 to 10% by weight, of water, the lower aliphatic carboxylic acid or both.