Various functionalized 2-aminobenzo[b]thiophenes have been synthesized at room temperature by the Ullmann coupling reaction for the first time. The enantiospecific coupling reaction has been further demonstrated without loss of optical purity. The newly synthesized 2-anilino-3-cyano-benzo[b]thiophenes are transformed into 11-amino-benzothieno[2,3-b]quinolines in the presence of triflic acid.
各种官能化的2-氨基苯并[ b ]噻吩在室温下首次通过乌尔曼偶合反应合成。已经进一步证明了对映特异性偶联反应,而没有光学纯度的损失。在三氟甲磺酸存在下,将新合成的2-苯胺基-3-氰基-苯并[ b ]噻吩转化为11-氨基-苯并噻吩并[2,3- b ]喹啉。
Double heteroannulation of S,N-acetals: a facile access to quinolone derivatives
A rapid construction of quinolone fused heterocycles from single S,N-acetal precursors via double heteroannulation is described. The base, radical and metal-mediated reactions can control the C–N, C–S and C–O bond formations of the S,N-acetal with high chemoselectivity.
Reductive homocoupling transformations mediated by bases and TMSCN have been used as a strategy for synthesis of 1,2-disubstituted ethanones. This protocol provides a method for synthesizing functionalized ethanones from aldehydes in one pot without transition metals.
Novel regioselective hydrodeoxygenation of α-diketones with phosphites as the deoxygenation reagent was realized via visible-light photoredox catalysis. Broad substrate scope and high functional group compatibility were obtained. Unsymmetric α-diketones were selectively reduced at the carbonyls of higher electrophilicity. This unique regioselectivity compared with available methods makes it a practical