Ylide is the key: The phosphane‐catalyzed [3+2] annulation of 2 a with aromatic aldehydes 1 to form tetrahydrofurans 3 in moderate to excellent yields is described (see scheme). This reaction represents an efficient and convergent one‐step route toward the construction of tetrahydrofurans and demonstrates a distinctive reactivity pattern of γ‐substituted allenoates with aldehydes.
叶立德是关键:的膦催化的[3 + 2]环2一个与芳香醛1以形成
四氢呋喃3在中度至良好的产率被描述(参见方案)。该反应代表了构建
四氢呋喃的一种有效且收敛的一步法,并且证明了γ-取代的烯
丙酸酯与醛的独特反应性模式。