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51206-73-6

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51206-73-6 Usage

Purification Methods

Purify 2-chloroskatole by chromatography on silica gel in CH2Cl2/pet ether (1:2), followed by recrystallisation from aqueous EtOH, aqueous AcOH or pet ether (m 113.5o). The picrate has m 121-122o(dec) (orange-red crystals from pet ether). [Phillips & Cohen J Am Chem Soc 108 2023 1986, Beilstein 20 H 317, 20 III/IV 3212.]

Check Digit Verification of cas no

The CAS Registry Mumber 51206-73-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,2,0 and 6 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 51206-73:
(7*5)+(6*1)+(5*2)+(4*0)+(3*6)+(2*7)+(1*3)=86
86 % 10 = 6
So 51206-73-6 is a valid CAS Registry Number.

51206-73-6Downstream Products

51206-73-6Relevant articles and documents

Substrate Specificity and Regioselectivity of Tryptophan 7-Halogenase from Pseudomonas fluorescens BL915

Hoelzer, Manuela,Burd, Wassily,Reissig, Hans-Ulrich,Van Pee, Karl-Heinz

, p. 591 - 595 (2001)

Tryptophan 7-halogenase which is involved in pyrrolnitrin biosynthesis is the first halogenating enzyme to be isolated that has substrate specificity and regioselectivity. This FADH2-dependent halogenase catalyzes the chlorination of its natural substrate tryptophan exclusively at the 7-position, a position at which direct chemical chlorination is not possible. Other substrates such as N-Ω-methyltryptamine, 5-methyltryptamine, 5-methylindole, 3-methylindole, or indole-3-acetonitrile are also chlorinated by the enzyme, whereas compounds like 1-methyltryptophan, indole-3-carboxylic acid, indole-3-acetic acid, or indole are not accepted as substrates. In addition, phenylpyrrole derivatives are also chlorinated by the enzyme. However, in contrast to tryptophan, the tryptophan and indole derivatives are chlorinated at positions 2 or/and 3 of the indole ring system and not at the 7-position. Chlorination of the phenylpyrrole derivatives also proceeds without regioselectivity and a mixture of mono- and dichlorinated products is obtained.

Reactivity of 3-substituted indolin-2-ones in Vilsmeier-type reactions of 4,6-dimethoxyindoles

Black, David St.C.,Ivory, Andrew J.,Kumar, Naresh

, p. 7003 - 7012 (2007/10/03)

4,6-Dimethoxy-2,3-diphenylindole 1 undergoes reaction with the 3-substituted indolin-2-ones 7,8,11-14 and either phosphoryl chloride or triflic anhydride to give the 2,7'-biindolyl 16, the 7,7'; 2,7'-terindolyls 19, 20 and the 7,7'-biindolyl 23.

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