A simple cobalt catalyst system for the efficient and regioselective cyclotrimerisation of alkynes.
نویسندگان
چکیده
The intermolecular cyclotrimerisation of terminal and internal alkynes can be catalysed by simple cobalt complexes such as a CoBr2(diimine) under mild reaction conditions when treated with zinc and zinc iodide with high regioselectivity in excellent yields.
منابع مشابه
Regioselective solvent-dependent benzannulation of conjugated enynes.
The transformation of enynes under cobalt-catalysis leads to symmetrical benzannulation products in dichloromethane. In tetrahydrofuran the cobalt-catalysed reactions afforded the unprecedented unsymmetrical benzannulation products in moderate to good yields and good regioselectivities. In addition, cyclotrimerisation of the alkyne subunit can be realised when electron-deficient enynes are appl...
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عنوان ژورنال:
- Chemical communications
دوره 11 شماره
صفحات -
تاریخ انتشار 2005