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197723-32-3

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197723-32-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 197723-32-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,7,2 and 3 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 197723-32:
(8*1)+(7*9)+(6*7)+(5*7)+(4*2)+(3*3)+(2*3)+(1*2)=173
173 % 10 = 3
So 197723-32-3 is a valid CAS Registry Number.

197723-32-3Relevant articles and documents

Total synthesis of vancomycin - Part 1: Design and development of methodology

Nicolaou,Li, Hui,Boddy, Christopher N. C.,Ramanjulu, Joshi M.,Yue, Tai-Yuen,Natarajan, Swaminathan,Chu, Xin-Jie,Braese, Stefan,Ruebsam, Frank

, p. 2584 - 2601 (2007/10/03)

o-Halosubstituted aromatic triazenes (e.g. I, Scheme 1) react with aryloxides (e.g. II, Scheme 1) in the presence of CuBr · Me2S, K2CO3 and pyridine in acetonitrile at reflux to afford biaryl ethers (e.g. V, Scheme 1). This general methodology (Tables 1 and 2) was applied to the construction of the C-O-D and D-O-E vancomycin model systems 37 (Scheme 2) and 50 (Scheme 3), demonstrating its potential in a projected total synthesis of vancomycin (1. Figure 1). For the construction of the vancomycin model AB biaryl ring system, a sequential strategy involving a Suzuki coupling of the C-O-D aryl iodide 74 (Scheme 7) and boronic acid 53 (Scheme 4), followed by macrolactamization was demonstrated, in which the preformed C-O-D ring framework served to preorganize the precursor for cyclization. The latter investigation led to Suzuki-coupling-based asymmetric synthesis of biaryl systems in which 2,2-bis(diphenylphosphino)-1,1'-binaphthyl (BINAP) was found to be the optimum ligand (Tables 3 and 4).

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