A One-Pot Tandem Pictet-Spengler-Diels-Alder Synthesis of Apoyohimbines from 3-Carbomethoxy-2-(formylmethyl)-3-sulfolene
摘要:
Pictet-Spengler reactions were carried out between 3-carbomethoxy-2-(formylmethyl)-3-sulfolene and tryptamines. Without isolation, the products were converted with complete stereoselectivity into apoyohimbine derivatives, via sulfur dioxide extrusion followed by intramolecular Diels-Alder cyclisation. (C) 1997 Published by Elsevier Science Ltd.
A One-Pot Tandem Pictet-Spengler-Diels-Alder Synthesis of Apoyohimbines from 3-Carbomethoxy-2-(formylmethyl)-3-sulfolene
摘要:
Pictet-Spengler reactions were carried out between 3-carbomethoxy-2-(formylmethyl)-3-sulfolene and tryptamines. Without isolation, the products were converted with complete stereoselectivity into apoyohimbine derivatives, via sulfur dioxide extrusion followed by intramolecular Diels-Alder cyclisation. (C) 1997 Published by Elsevier Science Ltd.
Gold‐catalyzed cascadereactions allow the rapidelaboration of pentacyclic indolo[2,3‐a]quinolizidines from N‐allyl tryptamines and ortho‐alkynylarylaldehydes. The tandem process combines a gold‐catalyzed Pictet‐Spengler reaction and a cyclization occurring concomitantly with an allyl transfer from the nitrogen atom to the stilbene function. Various substituted allyls were successfully transferred
金催化的级联反应可快速合成N-烯丙基色胺和邻炔基芳基醛中的五环吲哚[2,3- a ]喹唑烷。串联过程结合了金催化的Pictet-Spengler反应和伴随从氮原子到二苯乙烯官能团的烯丙基转移而发生的环化反应。成功地转移了各种取代的烯丙基,从而提供了高非对映选择性的典型产物,产率为60-98%。带有丁烯醇链的色胺在高非对映选择性下会进一步环化成手性半胱氨酸。
Gold(I)-Catalyzed Carboaminations of Allenes by <i>N</i>
-Allyltetrahydro-β-carbolines: An Experimental and Theoretical Study
N‐Allyltetrahydro‐β‐carbolines bearing a pendant allene undergo unprecedented gold(I)‐catalyzed cyclizations proceeding with an allyl migration from the nitrogen to the allene moiety. The initial product of the gold‐catalyzed cyclization evolves either via isomerization or Cope rearrangement, leading to different scaffolds. Density function theory (DFT) calculations established that the allyl migration
A One-Pot Tandem Pictet-Spengler-Diels-Alder Synthesis of Apoyohimbines from 3-Carbomethoxy-2-(formylmethyl)-3-sulfolene
作者:John Leonard、Andrew B Hague、Martin F Jones
DOI:10.1016/s0040-4039(97)00547-9
日期:1997.4
Pictet-Spengler reactions were carried out between 3-carbomethoxy-2-(formylmethyl)-3-sulfolene and tryptamines. Without isolation, the products were converted with complete stereoselectivity into apoyohimbine derivatives, via sulfur dioxide extrusion followed by intramolecular Diels-Alder cyclisation. (C) 1997 Published by Elsevier Science Ltd.