η3-Crotyltitanocenes react with acetals to produce homoallylic ethers. The intramolecular coupling involving tethered dienyl acetals provides a convenient access to vinylcycloalkanes and bicyclic fused compounds. This new cyclization reaction proceeds with a total regioselectivity in the exo fashion, and with good to excellent diastereoselectivity depending especially on the tether chain length.
η3-Crotyltitanocenes 与
缩醛反应生成均
烯丙基醚。涉及系链二烯基
缩醛的分子内偶联提供了获得
乙烯基环
烷烃和双环稠合化合物的便捷途径。这种新的环化反应以外型方式以总区域选择性进行,并且具有良好至极好的非对映选择性,尤其取决于系链长度。