Calcium-Catalyzed Direct Amination of π-Activated Alcohols
作者:Stefan Haubenreisser、Meike Niggemann
DOI:10.1002/adsc.201000768
日期:2011.2.11
A calcium-catalyzed direct amination of π-activated alcohols with different nitrogen nucleophiles under very mild reaction conditions is presented. The high reactivity of the calcium catalyst allows for an efficient conversion of secondary and tertiary benzylic and allylic as well as tertiary propargylic alcohols. Nitrogen nucleophiles such as carbamates, tosylamides and anilines are readily alkylated
Synthesis of Carbamates from Diethoxycarbonyl Hydrazine Derivatives by E1cB Eliminative Cleavage of the <i>N−N′</i>-Bond Rather than Reduction
作者:Philip Magnus、Negar Garizi、Kimberly A. Seibert、Alexandra Ornholt
DOI:10.1021/ol902313v
日期:2009.12.17
Treatment of diethoxycarbonyl hydrazine derivatives with methyl bromoacetate/Cs2CO3/MeCN at 50 °C followed by heating to 80 °C resulted in N−N′ bond cleavage to the corresponding carbamates.
在50°C下用溴乙酸甲酯/ Cs 2 CO 3 / MeCN处理二乙氧基羰基肼衍生物,然后加热至80°C,导致N-N '键裂解为相应的氨基甲酸酯。
Cs2CO3 or CaO as promoters of ethyl N-{[(4-methylphenyl)sulphonyl]oxy}carbamate in amination reactions
作者:Marco Barani、Stefania Fioravanti、Lucio Pellacani、Paolo A. Tardella
DOI:10.1016/s0040-4020(01)89425-4
日期:1994.1
Replacing triethylamine by heterogeneous inorganic bases makes it possible to animate benzene or other nitrene acceptors, using the title reagent, previously reported to be scarcely reactive. Products of C-H insertion and/or those coming from intermediate aziridines are also obtained.
Azimine. VI. 1-Alkoxycarbony 1-2,3-dialkyl- und -2,3-diaryl-azimine
作者:Christian Leuenberger、Lienhard Hoesch、Andr� S. Dreiding
DOI:10.1002/hlca.19820650120
日期:1982.2.3
AziminesVI: 1-Alkoxycarbonyl-2,3-dialkyl- and -2,3-diarylazimines
叠氮化物VI:1-烷氧羰基-2,3-二烷基-和-2,3-二芳基叠氮化物
Improved amination by ethyl n-(4-nitrophenyl)sulphonyloxy carbamate in the presence of inorganic oxides or carbonates
作者:Marco Barani、Stefania Fioravanti、M. Antonietta Loreto、Lucio Pellacani、Paolo A. Tardella
DOI:10.1016/s0040-4020(01)90402-8
日期:1994.3
Inorganic solid bases give rise to α-eliminationreactions of NsONHCO2Et under easy and mild conditions without catalyst or ultrasounds. For several kinds of substrates, a comparison of yields and reaction times with previous methods is presented.