A new method for the synthesis of nitrogen heterocycles via palladium catalyzed intramolecular hydroamination of allenes
作者:Masaki Meguro、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(98)01044-2
日期:1998.7
The intramolecularhydroamination of certain allenes, bearing amine or sulfonyl amide groups at the terminus of the carbon chain, proceeded smoothly in the presence of catalytic amounts of palladium complex ([(η3-C3H5)PdCl]2-dppf) under weakly acidic conditions (0.15-1.0 equivalent of acetic acid) to give the corresponding 2-vinylpyrrolidines and 2-vinylpiperidines in good to high yield.
某些丙二烯,带有胺或磺酰酰胺基团在碳链末端的分子内加氢胺化,在催化量的钯络合物的存在下平稳地进行([(η 3 -C 3 H ^ 5)的PdCl] 2 -dppf)下在弱酸性条件下(0.15-1.0当量的乙酸),以高至高收率得到相应的2-乙烯基吡咯烷和2-乙烯基哌啶。
Copper(II)-Promoted Cyclization/Difunctionalization of Allenols and Allenylsulfonamides: Synthesis of Heterocycle-Functionalized Vinyl Carboxylate Esters
作者:Barbara J. Casavant、Zainab M. Khoder、Ilyas A. Berhane、Sherry R. Chemler
DOI:10.1021/acs.orglett.5b02833
日期:2015.12.18
A unique method to affect intramolecular aminooxygenation and dioxygenation of allenols and allenylsulfonamides is described. These operationally simple reactions occur under neutral or basic conditions where copper(II) carboxylates serve as reaction promoter, oxidant, and carboxylate source. Moderate to high yields of heterocycle-functionalized vinyl carboxylate esters are formed with moderate to high levels of diastereoselectivity. Such vinyl carboxylate esters could serve as precursors to alpha-amino and alpha-oxy ketones and derivatives thereof.
A Highly Reactive Titanium Precatalyst for Intramolecular Hydroamination Reactions
作者:Lutz Ackermann、Robert G. Bergman
DOI:10.1021/ol0256724
日期:2002.5.1
[GRAPHIC]Tetrakisamido titanium complexes are significantly more active than Cp2TiMe2 (1) in the intramolecular hydroamination of aminoalkynes and aminoallenes. In the latter case, the regioselectivity of the transformation depends on the nature of the precatalyst, yielding the most selective and reactive catalysis with the bis(sulfonamido) complex 11.