synthetic and medicinal chemistry. Although unmasked ortho-benzoquinone has been used in [4+2] cycloadditions in sparse cases due to its multiple reactivity as diene, dienophile, heterodiene and heterodienophile, applications of this motif in cycloadditions of complex molecules are very rare. We report herein that this [4+2] process can be successfully extended to various polycyclic substrates, followed by
罗汉松型二萜的衍
生物,包括木薯型,松果油型和to烷型二萜,是广泛分布的
天然产物或合成和药物
化学中的常见中间体。尽管由于其作为二烯,二烯亲二烯,杂二烯和异二烯亲和性的多重反应性,在稀疏情况下未掩盖的邻苯甲醌已用于[4 + 2]环加成中,但这种基序在复杂分子的环加成中的应用非常少见。我们在这里报告说,此[4 + 2]过程可以成功地扩展到各种多环底物,然后进行光脱羰,以生成罗汉松型二萜的通用衍
生物。isolophanthins A&B和abietatrien-3的外消旋合成β-ol是在这种方法的基础上完成的。