Synthesis of Fused Carbocycles via a Selective 6-Endo Dig Gold(I)-Catalyzed Carbocyclization
摘要:
A gold-catalyzed synthesis of fused carbocycles via a regioselective 6-endo dig process is reported. The selectivity can be modulated by the steric and electronic properties of gold(I) complexes. The ligands can influence the pathway selectivity for the first bond formation rather than through a common intermediate generated after an Initial bond formation. This gold(I)-catalyzed transformation provides access to synthetically useful carbocyclic motifs that are found in numerous diterpenoid natural products.
Modular Assembly of Spirocarbocyclic Scaffolds through Pd<sup>0</sup>
-Catalyzed Intermolecular Dearomatizing [2+2+1] Annulation of Bromonaphthols with Aryl Iodides and Alkynes
A novel palladium(0)‐catalyzed dearomatizing [2+2+1] spiroannulation of 1‐bromo‐2‐naphthols with aryl iodides and alkynes was developed for the rapid assembly of spiro[indene‐1,1′‐naphthalen]‐2′‐ones. This three‐component cascade reaction was realized through consecutive Catellani‐type C−H activation, unsymmetrical biaryl coupling, alkyne migratory insertion, and arene dearomatization. The potential
Selective C(sp
<sup>3</sup>
)−N Bond Cleavage of
<i>N</i>
,
<i>N</i>
‐Dialkyl Tertiary Amines with the Loss of a Large Alkyl Group via an S
<sub>N</sub>
1 Pathway
alkyne-tethered aryl iodides with tertiary hydroxylamines has been developed for the rapid assembly of 3,4-fused tricyclic indoles with a removable aliphatic N-substituent. This domino reaction was realized by alkyne-directed palladacycle formation, electrophilic amination with tertiary hydroxylamines and selective C(sp3)−N bond cleavage with the loss of the larger alkyl group via an SN1 path.
已经开发了一种新型 Pd 0催化的 [2+2+1] 炔烃连接芳基碘化物与叔羟胺的环化反应,用于快速组装具有可去除脂肪族N取代基的 3,4-稠合三环吲哚。这种多米诺骨牌反应是通过炔烃定向的钯环形成、叔羟胺的亲电胺化和选择性 C(sp 3 )-N 键断裂以及通过 S N 1 路径损失更大的烷基来实现的。