Myrtucommulone A (1), which was isolated from myrtle and other species of the myrtaceae family, was synthesized through an enantioselective Michael addition of isobutyryl phloroglucinol (5) to isobutylidene syncarpic acid (4) that was induced by a chiral Al–Li–BINOL (1,1′-bi-2-naphthol) complex [(S,S)-ALB]. Because there is significant steric crowding in Michael acceptor 4, myrtucommulone A (1) was
从桃金娘和桃金娘科其他物种中分离出来的桃金娘 A (1) 是通过异丁酰间苯三酚 (5) 与异丁叉合果酸 (4) 的对映选择性迈克尔加成合成的,该加成是由手性 Al-Li-BINOL 诱导的(1,1'-bi-2-naphthol) 复合物 [(S,S)-ALB]。由于迈克尔受体 4 中存在显着的空间拥挤,因此获得了 ee 值为 70% 的桃金娘酮 A (1) 以及化学产率为 77% 的 meso-1。
Catalytic asymmetric total syntheses of myrtucommuacetalone, myrtucommuacetalone B, and callistrilones A, C, D and E
describe a concise catalytic approach to the first asymmetric total syntheses of myrtucommuacetalone, myrtucommuacetalone B, and callistrilones A, C, D and E. The syntheses proceed in only 5–7 steps from the readily available compound 11, without the need for protecting groups. Key features of the syntheses include a unique organocatalytic asymmetric Friedel–Crafts-type Michael addition with high enantioselectivity
在此,我们描述了一种简明的催化方法,用于首次不对称全合成桃金娘醋酮、桃金娘醋酮 B 和卡利斯三酮 A、C、D 和 E。从容易获得的化合物11开始,合成仅需 5-7 个步骤,无需保护团体。该合成的关键特征包括具有高对映选择性和广泛底物范围的独特有机催化不对称弗里德尔-克拉夫茨型迈克尔加成、新颖的迈克尔-缩酮化-成环级联反应以及氧化[3 + 2]环加成。此外,新化合物7对多种多重耐药菌株(MRSA、VISA和VRE)表现出有效的抗菌活性,并且比万古霉素具有更强的效力。