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870480-47-0 Usage


Preparation by reaction of acetic anhydride (4 equiv) with 3,4,5-trimethoxyphenol (1 equiv) in the presence of aluminium chloride (3 equiv) in nitromethane, first at 0°, then at r.t. for 20 h (74%).

Check Digit Verification of cas no

The CAS Registry Mumber 870480-47-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,0,4,8 and 0 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 870480-47:
180 % 10 = 0
So 870480-47-0 is a valid CAS Registry Number.

870480-47-0Relevant articles and documents

Synthesis of a capillarisin sulfur-analogue possessing aldose reductase inhibitory activity by selective isopropylation

Igarashi, Yasushi,Kumazawa, Hiroaki,Ohshima, Toshihoro,Satomi, Hisanori,Terabayashi, Susumu,Takeda, Shuichi,Aburada, Masaki,Miyamoto, Ken-Ichi

, p. 1088 - 1091 (2008/09/20)

We describe the synthesis of 2-[(4-hydroxyphenyl)thio]-7-isopropoxy-5,6- dimethoxy-4H-chromen-4-one 2 from 3,4,5-trimethoxyphenol 6 via the key intermediate, 3-iodo-7-isopropoxy-5,6-dimethoxy-4H-chromen-4-one 3. An important feature of this synthetic scheme involves selective alkylation, which can be achieved by two different routes. One route involves the selective isopropylation of a triacetate derivative 4 under basic conditions. The second route employs the selective demethylation of a trimethoxy derivative 5 under acidic conditions followed by isopropylation. The product of these alternative routes, compound 3, is then converted to a capillarisin sulfur analogue 2 in a one-pot reaction via the imidazolyl intermediate 22.

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