Co-cyclizations of nitrogen-containing acetylenes induced by a nickel triphenylphosphine complex to give aminoindane, isoindoline and isoindolinone derivatives
作者:D. Malcolm Duckworth、Simon Lee-Wong、Alexandra M. Z. Slawin、Edward H. Smith、David J. Williams
DOI:10.1039/p19960000815
日期:——
N-Methyl-, N,N-dimethyl-, N,N-diethylprop-2-ynylamines, N-prop-2-ynylacetamide and N-prop-2-ynylbenzamide are co-cyclized with diethyl hepta-1,6-diyne-4,4-dicarboxylate at room temperature in the presence of stoichiometric nickel(0) to give amino- and amido-indanes in fair to good yields. The structure of the product from N-prop-2-ynylbenzamide was established by X-ray crystallography. Likewise, N-alkyldiprop-2-ynylamines co-cyclize with methyl prop-2-ynyl ether to give isoindolines albeit in lower yields; the corresponding reaction of short chain N-alkynylalkynamides requires heating to 60 °C but gives isoindolinones and a 1,4-dihydroisoquinolin-3(2H)-one as mixtures of regioisomers in good yields. Attempts to synthesize medium-ring, benzo-fused lactams by this method failed.
在室温下,N-甲基、N,N-二甲基、N,N-二乙基丙-2-炔胺、N-丙-2-炔基乙酰胺和 N-丙-2-炔基苯甲酰胺与庚-1,6-二炔-4,4-二甲酸二乙酯在等当量镍(0)存在下发生共环化反应,得到氨基和脒基茚类化合物,收率从一般到良好。通过 X 射线晶体学,确定了 N-丙-2-炔基苯甲酰胺的产物结构。同样,N-烷基二丙基-2-炔胺与甲基丙-2-炔基醚发生共环化反应,生成异吲哚啉,但产率较低;短链 N-炔基炔酰胺的相应反应需要加热至 60 °C,但以良好的产率生成异吲哚啉酮和 1,4-二氢异喹啉-3(2H)-酮的区域异构体混合物。用这种方法合成中环苯并内酰胺的尝试失败了。