Iron‐Catalyzed Cross‐Dehydrogenative Coupling of Oxindoles with Thiols/Selenols for Direct C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−S/Se Bond Formation
作者:Lu‐Shan Huang、Dong‐Yang Han、Da‐Zhen Xu
DOI:10.1002/adsc.201900400
日期:2019.9.3
The C−X (S/Se) bonds are common and ubiquitous in natural products and pharmaceuticals. Here, we report an iron‐catalyzedcross‐dehydrogenativecoupling (CDC) reaction for the direct synthesis of C(sp3)−X (S/Se) bonds from oxindoles, phenylacetamides, pyrazolones, phenylacetonitriles and ethyl cyanoacetate with thiols and selenols. All the reactions were performed under simple and mild conditions,
Highly enantioselective Michael addition of 3-arylthio- and 3-alkylthiooxindoles to nitroolefins catalyzed by a simple cinchona alkaloid derived phosphoramide
A new cinchona alkaloid derived bifunctional tertiary amine-phosphoramide C1e is identified as a highly enantioselective catalyst for Michael addition of both unprotected 3-arylthio- and 3-alkylthiooxindoles to nitroolefins. The phosphoramide moiety of C1e plays an indispensable role in this reaction.
We report the first example of highly enantioselective synthesis of structurally diverse chiral dithioketalsviaasymmetric sulfenylation of various types of S-based nucleophiles, catalyzed by a cheap cinchona alkaloid derivative, dihydroquinine.