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Ring-Enlargement and Ring-Opening Reactions of Benzoxazole, Thiazoles, and Benzisoxazole by Zirconocene-Alkyne Complexes

✍ Scribed by Arndt, Perdita ;Lefeber, Claudia ;Kempe, Rhett ;Rosenthal, Uwe

Publisher
Wiley (John Wiley & Sons)
Year
1996
Tongue
English
Weight
513 KB
Volume
129
Category
Article
ISSN
0009-2940

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✦ Synopsis

Zirconocene I Titanocene I Benzoxazoles I Thiazoles J Benzisoxazoles Zirconocene alkyne complexes Cp2Zr(L)(Me3SiC2R) (L = Py, THF; R = %Mes, tBu) react with heterocyclic compounds like benzoxazole and related thiazoles t o yield ring-expanded adducts Cp,h-C(SiMe,) =C(R) -CH=No -C 6 h -k ( 1-3) and Cp2sC(SiMe3)=C(SiMes)-CH=N-C(Rf)=C(R')-k (R' = Me, H) (4, 5) by formal C-X (X = 0, S) bond cleavage and

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