A convenient 1,3-dipolar cycloaddition approach to pyridylpyrroles
摘要:
A variety of 2-, 3-, and 4-pyridylpyrroles were synthesized in good to excellent yields via the 1,3-dipolar cycloaddition of symmetrical and unsymmetrical munchnones and nitroalkenes. The unsymmetrical munchnones show moderate to excellent regioselectivity. (C) 2011 Elsevier Ltd. All rights reserved.
不对称Münchnones(1,3-Oxazolium-5-olates)与2-和3-硝基吲哚的区域选择性1,3-偶极环加成反应。吡咯并[3,4- b ]吲哚的新合成
摘要:
不对称介离子münchnones 13(3-苄基-2-甲基-4-苯基-1,3-恶唑鎓-5-醇钠)和14(3-苄基-4-甲基-2-苯基-1,3-恶唑鎓-5- -olate)与N-保护的2-和3-硝基吲哚1(2-硝基吲哚-1-羧酸乙酯),6(3-硝基-1-(苯基磺酰基)吲哚)和17(3-硝基吲哚-1)反应-羧酸盐)在回流的THF中提供良好或优异的收率,得到吡咯并[3,4- b ]吲哚15(2-苄基-1-甲基-3-苯基-4-羰基乙氧基-2,4-二氢吡咯并[3,4 - b ]吲哚),16(2-苄基-3-甲基-1-苯基-4-乙氧羰基-2,4-二氢吡咯并[3,4- b ]吲哚),18(2-苄基-1-甲基-3-苯基-4-(苯磺酰基)-2,4-二氢吡咯并[3,4- b ]吲哚)和19(2-苄基-3-甲基-1-苯基- 4-(苯磺酰基)-2,4-二氢吡咯并[3,4- b ]吲哚)。在某些情况下,与FMO理论所
What Controls Regiochemistry in 1,3-Dipolar Cycloadditions of Münchnones with Nitrostyrenes?
作者:Justin M. Lopchuk、Russell P. Hughes、Gordon W. Gribble
DOI:10.1021/ol402385v
日期:2013.10.18
The distinct experimentally observed regiochemistries of the reactions between mesoionic münchnones and β-nitrostyrenes or phenylacetylene are shown by DFT/BDA/ETS-NOCV analyses of the transition states to be dominated by steric and reactant reorganization factors, rather than the orbital overlap considerations predicted by Frontier Molecular Orbital (FMO) Theory.
Synthesis of 2- and 3-Indolylpyrroles via 1,3-Dipolar Cycloadditions of Münchnones and Nitroalkenes
作者:Gordon W. Gribble、Justin M. Lopchuk
DOI:10.3987/com-10-s(e)125
日期:——
A series of 2- and 3-indolylpyrroles were generated via 1,3-dipolar cycloadditions between (2-nitrovinyl)indoles and symmetrical and unsymmetrical 1,3-oxazolium-5-olates (munchnones).
Synthesis of fused isoindoles via 1,3-dipolar cycloaddition of 1,3-oxazolium-5-olates (münchnones) with nitro benzazoles
作者:Sergey Yu. Pechenkin、Aleksei M. Starosotnikov、Maxim A. Bastrakov、Vadim V. Kachala、Svyatoslav A. Shevelev
DOI:10.1016/j.mencom.2012.01.013
日期:2012.1
1,3-Dipolar cycloaddition of 1,3-oxazolium-5-olates at benzazoles nitrated at the benzene ring affords the corresponding azolo-isoindole derivatives.