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161856-02-6

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161856-02-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 161856-02-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,8,5 and 6 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 161856-02:
(8*1)+(7*6)+(6*1)+(5*8)+(4*5)+(3*6)+(2*0)+(1*2)=136
136 % 10 = 6
So 161856-02-6 is a valid CAS Registry Number.

161856-02-6Downstream Products

161856-02-6Relevant articles and documents

Process improvement in the preparation of (4R, 5S, 6S)-3-[[(2R,3R)-2-[[[(S)-2-amino-3-methyl-1-oxobutyl]amino]methyl]tetrahydro-3-furanyl]thio]-6-[(R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid

-

, (2008/06/13)

The invention is a process improvement for producing the carbapenem antibacterial agent (4R, 5S, 6S)-3-[[(2R, 3R)-2-[[[(S)-2-amino-3-methyl-1-oxobutyl]amino]methyl]tetrahydro-3-furanyl]thio]-6-[(R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid by hydrogenation of 4-nitrobenzyl (4R, 5S, 6S)-6-[(1R)-1-hydroxyethyl]-4-methyl-3-{[(2R, 3R)-2-({[(2S)-3-methyl-2-({[(4-nitrobenzyl)oxy]carbonyl}amino)butanoyl]amino}methyl)-tetrahydrofuran-3-yl]thio}-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate in a biphasic solvent mixture comprising a water portion and an organic solvent portion, not containing an acid acceptor. Separating the water portion from the organic portion and isolating (4R, 5S, 6S)-3-[[(2R, 3R)-2-[[[(S)-2-amino-3-methyl-1-oxobutyl]amino]methyl]tetrahydro-3-furanyl]thio]-6-[(R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid from the separated water portion by lyophilization or reverse osmosis.

Convergent syntheses of oral THF 1β-methylcarbapenems

Bitha, Panayota,Li, Zhong,Lin, Yang-I

, p. 643 - 648 (2007/10/03)

Convergent syntheses of oral THF 1β-methylcarbapenems 4 (OCA-983) and 5 starting from M2-phosphate 1 were developed. Reaction of the M2-phosphate 1 with THF thiols containing a requisite prodrug side chain, 9 and 10, gave the desired oral THF 1β-methylcarbapenems 4 and 5, respectively, in 46% and 42% overall yields.

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