75304-07-3

Upstream product

• 75304-06-2 1-ethyl-2-benzoyl-1,2,3,4-tetrahydro-9H-pyrido<3,4-b>indole 
• 61-54-1 tryptamine 
• 6678-86-0 1‐ethyl‐1,2,3,4‐tetrahydro‐β‐carboline 

Relevant academic research and scientific papers

Selenium Dioxide Oxidations in the Indole Area. Synthesis of β-Carboline Alkaloids

A number of different piperidoindole systems have been subjected to oxidation with selenium dioxide.The bonding between the indole and piperidine unit has been varied to provide different systems, the oxidation of which has led to formation of either 2-acyl- or 3-acylindoles or fully aromatic β-carbolines, depending on the substrate chosen.The pattern of reactivity observed was in complete agreement with the ene mechanism proposed for selenium dioxide oxidations, and this can be employed to predict the regiochemistry of the oxidation.Use of this technology has resulted in a two-step synthesis of the indole alkaloid canthin-6-one (30a).

Dichlorodicyanoquinone Oxidations in the Indole Area. Synthesis of Crenatine

The influence of temperature on the reaction of dichlorodicyanoquinone (DDQ) with 1,2,3,4-tetrahydro-β-carbolines has been explored.The DDQ oxidation of amide 2a, when performed at room temperature, gave 3a (3-acylindole)/4 (2-acylindole) in a ratio of ca. 1:1, while this was increased to 2:1 at 0 deg C and to ca. 5:1 at -78 deg C.This method for preparation of 4-oxo-β-carbolines has been employed for synthesis of the β-carboline alkaloid crenatine (11).In addition, treatment of the 4-oxotetrahydro-β-carboline (3b) with hydrazine gave 1-ethyl-4-amino-β-carboline (12) which should provide access to a series of 4-substituted β-carbolines.

SELENIUM DIOXIDE OXIDATIONS IN THE β-CARBOLINE AREA

The reaction of 1-ethyl-3-methoxycarbonyl-1,2,3,4-tetrahydro-β-carboline 11 with selenium dioxide has resulted in the synthesis of the β-carboline alkaloids, 1-acetyl-3-methoxycarbonyl-β-carboline 14 and 1-acetyl-β-carboline 15.Application of this technol