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931581-20-3

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931581-20-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 931581-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,3,1,5,8 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 931581-20:
(8*9)+(7*3)+(6*1)+(5*5)+(4*8)+(3*1)+(2*2)+(1*0)=163
163 % 10 = 3
So 931581-20-3 is a valid CAS Registry Number.

931581-20-3Relevant articles and documents

Total Synthesis of the (+)-Antimycin A Family

Inai, Makoto,Nishii, Takeshi,Tanaka, Ayako,Kaku, Hiroto,Horikawa, Mitsuyo,Tsunoda, Tetsuto

, p. 2719 - 2729 (2011/06/23)

An asymmetric aldol reaction using Oppolzer's sultam has provided a practical and efficient synthetic route (15 steps, overall yield ca. 24%) to 12 compounds of the Antimycin A family and deisovalerylblastmycin, which were obtained in pure form on a 60-300 mg scale. In the syntheses, the nine-membered dilactone ring was constructed successfully by lactonization of a 2-pyridinethiol ester bearing a TIPS group on the 8-OH by using the (CuOTf) 2A·PhH complex. An asymmetric aldol reaction usingOppolzer's sultam has provided a practical and efficient synthetic route (15 steps, overall yield ca. 24%) to 12 compounds of the antimycin A family and deisovalerylblastmycin, which were obtained in pure form on a 60-300 mg scale.

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