Practical Organocatalytic Synthesis of Functionalized Non-<i>C</i>
<sub>2</sub>
-Symmetrical Atropisomeric Biaryls
作者:Hongyin Gao、Qing-Long Xu、Craig Keene、Muhammed Yousufuddin、Daniel H. Ess、László Kürti
DOI:10.1002/anie.201508419
日期:2016.1.11
and the structurally diverse 2,2′‐dihydroxy biaryl (i.e., BINOL‐type), as well as 2‐amino‐2′‐hydroxy products (i.e., NOBIN‐type) are formed with complete regioselectivity. Density‐functional calculations suggest that the quinone and imino‐quinone monoacetal coupling partners are exclusively arylated at their α‐position by an asynchronous [3,3]‐sigmatropic rearrangement of a mixed acetal species which
开发了一种有机酸催化苯酚和萘酚中芳香族 C(sp 2 ) H 键的直接芳基化反应,用于制备 1,1' 连接的官能化联芳基化合物。该产品是非C 2对称的、阻转异构的,代表了以前未开发的化学空间。总体而言,这种转化操作简单,不需要外部氧化剂,易于放大(高达 98 mmol),并且结构多样的 2,2'-二羟基联芳基(即 BINOL 型)以及 2-氨基‐2'-羟基产物(即NOBIN型)的形成具有完全的区域选择性。密度泛函计算表明,醌和亚氨基醌单缩醛偶联伴侣通过在反应条件下原位形成的混合缩醛物质的异步[3,3]-σ重排在其α位上完全芳基化。