Metal-promoted cyclization. 19. Novel bicyclization of enynes and diynes promoted by zirconocene derivatives and conversion of zirconabicycles into bicyclic enones via carbonylation
[GRAPHICS]Treatment of 1,6-enynes with tetramethallylchromate induces a cyclization reaction with concurrent introduction of a methallyl group. A catalytic amount of CrCl3 combined with methallyl magnesium chloride also achieves this cyclization process. The resultant cyclic organometallic species undergo further functionalization upon reaction with electrophiles.
NEGISHI EI-ICHI; SWANSON D. R.; CEDERBAUM F. E.; TAKAHASHI TAMOTSU, TETRAHEDRON LETT., 28,(1987) N 9, 917-920
作者:NEGISHI EI-ICHI、 SWANSON D. R.、 CEDERBAUM F. E.、 TAKAHASHI TAMOTSU