１，２‐ジベンゾイルエチレンおよびｃｉｓ‐α，β‐ジベンゾイルスチレンの無水塩化アルミニウムを加えてのアルミニウムイソプロポキシドによる還元

Abstract

In the reduction of 1, 2-dibenzoylethylene [1a, b] with aluminum isopropoxide, the addition of aluminum chloride increased the yields of furan derivatives [5], [6] or [7].The cis-isomer was isomerized to trans- under the reduction conditions. Prom cis-a, pdibenzoyistyrene [2], 2, 3, 5-triphenylfuran [8] was obtained without aluminum chloride, and 3-alkoxy-2, 4, 5-triphenylfurans [9] and [10] were readily formed in the pres ence of aluminum chloride.The structures of products [6], [7], [9] and [10] were established on the basis of spectral data (Table 5).Probable mechanisms for the formation of the furan ring are shown in Scheme 1.