Synthesis of 1,3,5-trisubstituted pyrazolines via Zn(ii)-catalyzed double hydroamination of enynes with aryl hydrazines
作者:Nitin T. Patil、Vipender Singh
DOI:10.1039/c1cc14850h
日期:——
An efficient Zn(II)-catalyzed intermolecular double hydroamination of 1,3-enynes with aryl hydrazines, for the synthesis of pyrazolines, has been discussed.
讨论了一种高效的Zn(II)催化的1,3-炔烃与芳香肼的分子间双氢胺化反应,用于合成吡唑啉。
Zinc-mediated enantioselective addition of terminal 3-en-1-ynes to cyclic trifluoromethyl ketimines
作者:Yue Zhang、Jing Nie、Fa-Guang Zhang、Jun-An Ma
DOI:10.1016/j.jfluchem.2018.01.008
日期:2018.4
A facile enantioselectiveaddition of terminal 3-en-1-ynes to cyclic N-acyl trifluoromethyl ketimines is reported. In the presence of Zinc/BINOL complexes, a series of enynylated tertiary carbinamines were readily obtained in 90–97% yield with 70–97% enantiomeric excess in a single chemical operation under mild reaction conditions.
The title iododienes have been prepared from 6-phenylhex-3-en-yne by the addition of methylmagnesiumtributyltin, followed by reactions of stannylmagnesium intermediate Awith appropriate electrophiles and of the resulting alkylated stannylidiene Bwith iodine.
标题碘二烯由 6-苯基己-3-烯-炔通过添加甲基三丁基锡镁,然后甲锡烷基镁中间体 A 与适当的亲电子试剂反应以及所得烷基化甲锡烷基 B 与碘反应来制备。
Cu(I)-Catalyzed Oxidative Cyclization of Alkynyl Oxiranes and Oxetanes
In the presence of a Cu(I) catalyst and a pyridine oxide, alkynyl oxiranes and oxetanes can be converted into functionalized five- or six-membered α,β-unsaturated lactones or dihydrofuranaldehydes. This new oxidative cyclization is proposed to proceed via an unusual allenyloxypyridinium intermediate.
Asymmetric Enynylation of<i>N</i>-Sulfonyl Aldimines Catalyzed by Zn-BINOL Complexes
作者:Zhen-Yan Yang、Tian-Lin Liu、Yan Zheng、Shen Li、Jun-An Ma
DOI:10.1002/ejoc.201500400
日期:2015.6
An efficient enynylation of N-sulfonyl aldimines is described herein. In the presence of Zn-BINOLcomplexes, catalytic enantioselective addition reactions of terminal 3-en-1-ynes to N-sulfonyl aldimines proceed smoothly to produce enynylated carbinamines in up to 96 % yield and 95 % ee. The adducts are versatile synthetic intermediates that readily undergo Pauson–Khand cycloaddition reactions to give