Facile Synthesis of 2,3,6,11-Tetrahydro-1H,5H-indolizino[8,7-<i>b</i>]indole-11<i>b</i>-Carboxylic Acid Methyl Ester via a 9-BBN-Mediated Tertiary Lactam Reduction
作者:Demosthenes Fokas、Zhimin Wang
DOI:10.1080/00397910802238684
日期:2008.10.22
facile synthesis of 2,3,6,11-tetrahydro-1H,5H-indolizino[8,7-b]indole-11b-carboxylic acidmethyl ester, a versatile intermediate utilized in the synthesis of indole alkaloids, was achieved in two steps. Condensation of tryptamine with dimethyl α-ketoglutarate led to the formation of the corresponding indolizino[8,7-b]indolone ester, which subsequently underwent an efficient lactam reduction with 9-BBN
Bioinspired Collective Syntheses of Iboga-Type Indole Alkaloids
作者:Gaoyuan Zhao、Xingang Xie、Haiyu Sun、Ziyun Yuan、Zhuliang Zhong、Shouchu Tang、Xuegong She
DOI:10.1021/acs.orglett.6b00989
日期:2016.5.20
We present the application of a bioinspired collective synthesis strategy in the total syntheses of seven iboga-type indole alkaloids: (±)-tabertinggine, (±)-ibogamine, (±)-ibogaine, (±)-ibogaine hydroxyindolenine, (±)-3-oxoibogaine hydroxyindolenine, (±)-iboluteine, and (±)-ervaoffines D. In particular, tabertinggine and its congeners serve as iboga precursors for the subsequent biomimetic transformations
Carboxyl-mediated pictet-spengler reaction. Direct synthesis of 1,2,3,4-tetrahydro β-carbolines from tryptamine-2-carboxylic acids.
作者:Krishnaswamy Narayanan、James M Cook
DOI:10.1016/s0040-4039(00)97406-9
日期:1990.1
The Pictet-Spengler condensation of various tryptamine-2-carboxylicacids 1 with carbonyl compounds in benzene/dioxane/trifiuoroacetic acid (Table) with simultaneous loss of carbon dioxide, afforded directly the corresponding 1,2,3,4-tetrahydro β-carbolines 4 in good to excellent yields.
Enantioselective Pictet–Spengler Condensation to Access the Total Synthesis of (+)‐Tabertinggine
作者:Dan Long、Gaoyuan Zhao、Zhiqiang Liu、Peiqi Chen、Shiqiang Ma、Xingang Xie、Xuegong She
DOI:10.1002/ejoc.202200088
日期:2022.3.15
An effective catalytic enantioselective Pictet–Spengler condensation/intramolecular lactamization cascade reaction to construct the tetracyclic lactam is presented, and the total synthesis of (+)-tabertinggine was obtained.