作者:Anusueya Kumari、Muthiah Suresh、Raj Bahadur Singh
DOI:10.1016/j.tet.2021.132282
日期:2021.7
intramolecular Freidel-Crafts acylation allows to develop the critical indanone moiety, a key intermediate of this synthesis. A careful ortho-selective formylation and subsequent Knoevenagel condensation to incorporate three carbon side chain, followed by reduction, formation of tricyclic lactone and DIBAL-H supported reduction of lactone to target were other key transformation involved. The NMR spectroscopic
Tabasesquiterpene A 的拟议结构是一种伊卢达烷型倍半萜烯,由 2-甲氧基-4-甲基苯甲醛分十二步合成,总产率为 40%。三氟甲磺酸介导的分子内 Freidel-Crafts 酰化允许开发关键的茚满酮部分,这是该合成的关键中间体。仔细的邻位选择性甲酰化和随后的 Knoevenagel 缩合以合并三个碳侧链,然后还原、形成三环内酯和 DIBAL-H 支持将内酯还原为目标是涉及的其他关键转化。合成样品的 NMR 光谱数据与天然油桐木 A 的数据不同。