Laatsch, Hartmut; Schmidt, Andreas Johann; Kral, Andreas, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 6, p. 476 - 484
Thermochromic Furofurans. IV. Approach to the synthesis of bridgehead substituted furo[3,2-b]furans and side products of McMurry reactions
摘要:
Substituted dihydroxystilbenes 2 are suitable starting materials for the synthesis of photochromic systems derived from 3/4. Attempts to couple the naphthones 8a-8e by the McMurry reaction with TiCl3/LiAlH4 yielded mainly reduction products such as 8f, g or 9. However, the furofuran 3b was isolated when using the zinc-copper couple for reduction. The helicene 11 was formed as an unexpected byproduct in the McMurry reaction of the pivaloylnaphthalene 8d.