Horner–Wadsworth–Emmons reaction and acetal formation. The meso-syn-2,7-dimethyloxepane derivative was synthesized via photoinduced electrocyclization of a conjugated exo-diene under flow conditions, giving a cyclobutene derivative, followed by ring expansion via oxidative cleavage and diastereoselective reduction of a β-hydroxy ketone.
加勒比雪卡毒素 C-CTX-1 的 MN 环是由对应于 M 环的内消旋顺式-2,7-二甲基氧杂
环庚烷衍
生物通过与
樟脑衍
生物形成
缩醛的去对称作用合成的,然后通过 Horner 构建 N 环–Wadsworth-Emmons 反应和
缩醛形成。通过在流动条件下共轭外型二烯的光诱导电环化合成内消旋-顺式-2,7-二甲基氧杂
环庚烷衍
生物,得到
环丁烯衍
生物,然后通过氧化裂解和β-羟基酮的非对映选择性还原进行扩环。