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221539-43-1

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221539-43-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 221539-43-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,3 and 9 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 221539-43:
(8*2)+(7*2)+(6*1)+(5*5)+(4*3)+(3*9)+(2*4)+(1*3)=111
111 % 10 = 1
So 221539-43-1 is a valid CAS Registry Number.

221539-43-1Relevant articles and documents

Synthesis and evaluation of quinazoline amino acid derivatives as mono amine oxidase (MAO) inhibitors

Khattab, Sherine Nabil,Haiba, Nesreen Saied,Asal, Ahmed Mosaad,Bekhit, Adnan A.,Amer, Adel,Abdel-Rahman, Hamdy M.,El-Faham, Ayman

, p. 3574 - 3585 (2015)

Abstract A series of quinazolinone amino acid ester and quinazolinone amino acid hydrazides were prepared under microwave irradiation as well as conventional condition. The microwave irradiation afforded the product in less reaction time, higher yield and

Total synthesis of asperlicin C, circumdatin F, demethylbenzomalvin A, demethoxycircumdatin H, sclerotigenin, and other fused quinazolinones

Tseng, Ming-Chung,Yang, Huei-Yun,Chu, Yen-Ho

experimental part, p. 419 - 427 (2010/02/16)

Using scandium triflate and microwaves, the direct double dehydrocyclization of anthranilate-containing tripeptides was achieved, affording the total syntheses of (i) quinazolino[3,2-a]benzodiazepinediones (1a-f), (ii) diazepino[2,1-b]quinazolinediones (2a-e), and (iii) pyrazino[2,1-b]quinazolinediones (3a-e) with good overall isolated yields (23-43%, 37-47% and 31-56%, respectively). Among the quinazolino[3,2-a] benzodiazepinediones synthesized, 1a (sclerotigenin), 1b (circumdatin F), and 1f (asperlicin C) are natural products.

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