Synthesis of substituted disulfonyl-containing polycyclic azines with the bridgehead nitrogen atom. Effects of the structure of 3-substituted pyridinium ylides on the regioselectivity of their reactions with E-1,2-di(alkylsulfonyl)-1,2-dichloroethenes
作者:N. E. Dontsova、A. M. Shestopalov
DOI:10.1007/s11172-017-1851-3
日期:2017.6
Heating the substituted pyridinium and isoquinolinium salts with E-1,2-di(alkylsulfonyl)-1,2-dichloroethenes in either chloroform or acetone in the presence of three-fold excess of Et3N gave high yields of substituted 1,2-di(alkylsulfonyl)indolizines and 1,2-di(alkylsulfonyl) pyrrolo[2,1-a]isoquinolines, respectively. Effects of the structure of 3-substituted pyridiniumylides on the regioselectivity
Bahner et al., Journal of the American Chemical Society, 1952, vol. 74, p. 3960
作者:Bahner et al.
DOI:——
日期:——
Efficient synthesis of indolizines and new imidazo[1,2-a]pyridines via the expected cyclization of aromatic cycloimmonium ylides with electron deficient alkynes and ethyl cyanoformate
作者:C. Sandeep、Basavaraj Padmashali、Rashmi S. Kulkarni
DOI:10.1016/j.tetlet.2013.09.033
日期:2013.11
Aromatic cycloimmonium ylides underwent smooth cyclization with electron deficient alkynes in presence of anhydrous K2CO3 in DMF solvent at room temperature to afford substituted indolizines. Ylides have also undergone expected cyclization with ethyl cyanoformate to produce imidazo[1,2-a]pyridines. The structures of these newly synthesized compounds have been confirmed by spectroscopic techniques and
在室温下,在DMF溶剂中,在无水K 2 CO 3的存在下,用缺电子炔烃对芳族环亚胺基进行平滑环化反应,得到取代的吲哚嗪。氰化物也已用氰基甲酸乙酯进行了预期的环化反应,生成了咪唑并[1,2- a ]吡啶。这些新合成的化合物的结构已通过光谱技术和X射线衍射研究得到证实。
Cu(OAc)<sub>2</sub>–Et<sub>3</sub>N mediated oxidative coupling of α-azido ketones with pyridinium ylides: utilizing in situ generated imines for regioselective synthesis of imidazo[1,2-a]pyridines