期刊
TETRAHEDRON
卷 63, 期 13, 页码 2787-2797出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.01.027
关键词
magnesium; functionalized organomagnesium reagents; cyclo-addition; functionalized 3,4-pyridyne; halogen-magnesium exchange
The preparation of functionalized 3,4-pyridynes of type 1 as highly reactive intermediates has been achieved by the controlled elimination of readily generated 2-magnesiated diaryl sulfonates of type 2 obtained by a low temperature I/Mg- or Br/Mg-exchange starting from the corresponding halides of type 3. After trapping with furan, moderate to good yields of the desired functionalized cycloadducts of type 4 are obtained. The addition of a magnesium arylthiolate or magnesium phenylselenide to 3,4-pyridyne followed by quenching with an electrophile is also described. (c) 2007 Elsevier Ltd. All rights reserved.
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