A novel [4+1] spiroannulation of o‐ & p‐bromophenols with α,β‐unsaturated imines has been developed for the direct synthesis of a new family of azaspirocyclic molecules. Notably, several other halophenols (X=Cl, I) were also applicable for this transformation. Moreover, a catalytic asymmetric version of the reaction was realized with 1‐bromo‐2‐naphthols by using a chiral ScIII/Py‐Box catalyst. Mechanistic
已经开发了一种新颖的[4 + 1]邻和对溴苯酚与α,β-不饱和亚胺螺环合成的方法,用于直接合成新的氮杂螺环分子家族。值得注意的是,其他几种卤代酚(X = Cl,I)也适用于该转化。此外,通过使用手性Sc III / Py-Box催化剂,使用1-溴-2-萘酚实现了反应的催化不对称形式。机理研究表明,该多米诺反应是通过苯酚衍生物在其卤代位置的亲电触发的脱芳香化作用进行的,然后通过基于自由基的S RN 1机理用N-亲核试剂进行卤素置换。
Organocatalytic Enantioselective Synthesis of Atropisomeric Aryl‐
<i>p</i>
‐Quinones: Platform Molecules for Diversity‐Oriented Synthesis of Biaryldiols
作者:Ye‐Hui Chen、Heng‐Hui Li、Xiao Zhang、Shao‐Hua Xiang、Shaoyu Li、Bin Tan
DOI:10.1002/anie.202004671
日期:2020.7.6
Presented here is a class of novel axiallychiral aryl‐p ‐quinones as platform molecules for the preparation of non‐C2symmetric biaryldiols. Two sets of aryl‐p ‐quinone frameworks were synthesized with remarkable enantiocontrol by means of chiral phosphoric acid catalyzed enantioselective arylation of p ‐quinones by central‐to‐axialchirality conversion. These aryl‐p ‐quinones were then used to access
Process for the industrial synthesis of the compound of formula (I):
公开了一种工业合成式(I)化合物的方法:
In(OTf)<sub>3</sub>-Catalyzed Synthesis of 2,3-Dihydro-1<i>H</i>-benzo[<i>e</i>]indoles and 2,3-Dihydrobenzofurans via [3 + 2] Annulation
作者:Shuxuan Liu、Yu Zang、Hai Huang、Jianwei Sun
DOI:10.1021/acs.orglett.0c02729
日期:2020.11.6
An In(OTf)3-catalyzed intermolecular [3 + 2] annulation for the synthesis of 2,3-dihydro-1H-benzo[e]indoles and 2,3-dihydrobenzofurans from readily available substrates has been achieved. This approach takes advantage of oxetane and para-quinone methide as important functional units in the key intermediate. β-Naphthylamines and phenols have been demonstrated as excellent reaction partners.
已实现了一种由In(OTf)3催化的分子间[3 + 2]环合反应,用于从易于获得的底物中合成2,3-二氢-1 H-苯并[ e ]吲哚和2,3-二氢苯并呋喃。该方法利用氧杂环丁烷和对苯二甲酰甲烷作为关键中间体中的重要功能单元。β-萘胺和苯酚已被证明是极好的反应伴侣。