Enantioselective Total Synthesis and Absolute Configuration Assignment of (+)‐Tronocarpine Enabled by an Asymmetric Michael/Aldol Reaction
作者:Dong‐Xing Tan、Jie Zhou、Chao‐You Liu、Fu‐She Han
DOI:10.1002/anie.201914868
日期:2020.3.2
We present the firstasymmetric total synthesis and absoluteconfigurationdetermination of (+)-tronocarpine. The [6.5.7.6.6] pentacyclic core was constructed at an early stage by using a sequential cyclization strategy through a newly developed catalytic asymmetric Michael/aldol cascade to build the aza[3.3.1]-bridged cycle and a tandem reduction/hemiamidation procedure to assemble the seven-membered
Synthesis of 2-aryltryptamines with palladium catalyzed cross-coupling of 2-bromotryptamines and arylboronic acids
作者:Lin Chu、Michael H. Fisher、Mark T. Goulet、Matthew J. Wyvratt
DOI:10.1016/s0040-4039(97)00797-1
日期:1997.6
A versatile and high-yielding synthesis of 2-aryltryptamines employing palladium(0) catalyzed cross-coupling of 2-bromotryptamines and arylboronicacids was developed. The preparation of the intermediate 2-bromotryptamines with pyridine hydrobromide perbromide as the brominating agent, is also reported.
A gold(I)-catalyzed hydroamination/cycloisomerization cascade reaction was developed to yield indolizino[8,7-b]indole and indolo[2,3-a]-quinolizine derivatives from 2-ethynyltryptamides. The optimal conditions were determined by condition screening, and the functional group tolerances of these reactions were explored based on synthetic substrates. An insight into the explanation on the selectivity
开发了金(I)催化的加氢胺化/环化异构化级联反应,从2-乙炔基色酰胺中产生吲哚并[8,7- b ]吲哚和吲哚[2,3- a ]-喹嗪衍生物。通过条件筛选确定了最佳条件,并根据合成底物探索了这些反应的官能团耐受性。通过密度泛函理论计算,深入了解了闭环选择性的解释。提出了级联反应的合理机制。吲哚并[8,7- b ]吲哚的衍生化和诺环定的全合成证明了该策略的实用性。