Syntheses of variously substituted allenediynes where the allene moiety is at the terminal or internal position are described. Their cobalt(I)-mediated [2+2+2] cycloaddition reactions led to the corresponding eta(4)-complexed tricyclic compounds; the regioselectivity of these cyclizations depending on the substitution and the position of the allene is discussed. (C) 1998 Elsevier Science Ltd. Ali rights reserved.
Aubert Corinne, Llerena Dominique, Malacria Max, Tetrahedron Lett, 35 (1994) N 15, S 2341-2344
作者:Aubert Corinne, Llerena Dominique, Malacria Max