Microwave-assisted synthesis of primary amine HX salts from halides and 7 M ammonia in methanol
作者:Mark G. Saulnier、Kurt Zimmermann、Charles P. Struzynski、Xiaopeng Sang、Upender Velaparthi、Mark Wittman、David B. Frennesson
DOI:10.1016/j.tetlet.2003.10.146
日期:2004.1
on a variety of alkyl halides, as well as mesylates and tosylates. Benzylamines are obtained frombenzylhalides without significant amounts of the secondary amine side products that result without microwave heating. Direct isolation of even highly volatile primary amines as their hydrogen halide salts makes the method ideal for use in parallel synthesis.
Unexpected selectivity in ruthenium-catalyzed hydrosilylation of primary amides: synthesis of secondary amines
作者:Bin Li、Jean-Baptiste Sortais、Christophe Darcel
DOI:10.1039/c3cc39149c
日期:——
Selectiveruthenium-catalyzed reductive coupling of primary amides under hydrosilylation conditions is achieved using an one pot procedure. Using 3 equiv. of phenylsilane and [RuCl2(mesitylene)]2 (1-2 mol%) as the catalyst at 100 degrees C under neat conditions, secondary symmetric amines were obtained in good yields and with high chemoselectivities.
Dimethylamine as a Substrate in Hydroaminoalkylation Reactions
作者:Jens Bielefeld、Sven Doye
DOI:10.1002/anie.201708959
日期:2017.11.20
Size matters: For the first time since catalytic hydroaminoalkylation chemistry started 37 years ago, dimethylamine can efficiently be added to alkenes using an inexpensive and easilyobtainable Ti catalyst. The size of the flask determines whether the reaction gives monohydroaminoalkylation or dihydroaminoalkylation.
Convenient Preparations of Imines and Symmetrical Secondary Amines Possessing Primary or Secondary Alkyl Groups
作者:Alan R. Katritzky、Xiaohong Zhao、Gregory J. Hitchings
DOI:10.1055/s-1991-26551
日期:——
Hindered alkyl aldehydes react with benzotriazole and ammonia in dry ethanol or methanol to yield the corresponding bis[1-(benzotriazol-1-yl)alkyl]amines 2. The reaction of aryl aldehydes, however, yields 1-(benzotriazol-1-yl)-N-alkylidenealkylamines 3. The reactions of adducts 2 and 3 with lithium aluminum hydride furnishes dialkyl- and dibenzylamine derivatives 4. Although the reactions of 2 and 3 with organometallic reagents are not as general, in several cases the reactions of amines 2 with Grignard reagents yield 1-alkyl or aryl substituted N-alkylidenealkylamines 5. Similar reactions of amines 2 with phenyl lithium afford 1,1′-diphenyldialkylamines 7.
The process of the reductiveamination of aldehydes or ketones in the presence of ammonia using unsupported ultra-thin Pt nanowires has been developed. This catalytic system shows high activity and selectivity under mild reaction conditions.