scholarly journals Marine Sponge/H3PO4: As a Naturally Occurring Chiral Catalyst for Solvent-free Fischer-Indole Synthesis

2013 ◽  
Vol 8 (4) ◽  
pp. 160-164
Author(s):  
Mohammad Reza Shushizadeh ◽  
Azar Mostoufi ◽  
Rashid Badri ◽  
Somaye Azizyan
Synthesis ◽  
2018 ◽  
Vol 51 (07) ◽  
pp. 1611-1622 ◽  
Author(s):  
Alexey Fedorov ◽  
Ekaterina Shchegravina ◽  
Elena Svirshchevskaya ◽  
Hans-Günther Schmalz

A six-step semisynthetic approach towards chiral nonracemic pyrrolo-allocolchicinoids starting from naturally occurring colchicine was developed. The synthetic scheme includes an electrocyclic tropolone ring contraction to afford allocolchicinic acid followed by the Curtius reaction, giving the corresponding aniline. The Sandmeyer reaction and copper-mediated hydrazination gave hydrazine-substituted allocolchicine. This was introduced into the Fischer indole synthesis, affording libraries of regioisomeric indole-based allocolchicine congeners.


2021 ◽  
Vol 23 (3) ◽  
pp. 1096-1102
Author(s):  
Hyunho Chung ◽  
Jeongyun Kim ◽  
Gisela A. González-Montiel ◽  
Paul Ha-Yeon Cheong ◽  
Hong Geun Lee

Author(s):  
Jianguo Xu ◽  
Jiangang Yu ◽  
Yi Jin ◽  
Jie Li ◽  
Zhiqun Yu ◽  
...  

1966 ◽  
Vol 14 (9) ◽  
pp. 934-939 ◽  
Author(s):  
Yuichi Kanaoka ◽  
Yoshio Ban ◽  
Koichi Miyashita ◽  
Kimiko Irie ◽  
Osamu Yonemitsu

2018 ◽  
Vol 61 (7-8) ◽  
pp. 685-688 ◽  
Author(s):  
Hien Vuong ◽  
Samantha Duarte ◽  
Douglas A. Klumpp

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