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87554-50-5

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87554-50-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87554-50-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,5,5 and 4 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 87554-50:
(7*8)+(6*7)+(5*5)+(4*5)+(3*4)+(2*5)+(1*0)=165
165 % 10 = 5
So 87554-50-5 is a valid CAS Registry Number.

87554-50-5Downstream Products

87554-50-5Relevant articles and documents

Heterocyclic GABA Agonists. Synthesis and Crystal Structure of (RS)-5-(N-t-Butyloxycarbonylaminomethyl)-3-oxoisoxazolidine-2-carboxamide, a Derivative of Dihydromuscimol

Brehm, Lotte,Jacobsen, Poul,Johansen Joergen S.,Krogsgaard-Larsen, Povl

, p. 1459 - 1464 (2007/10/02)

Reaction of the O- and N-protected (RS)-3-hydroxy-4-aminobutyric acid ester (4) with hydroxyurea under basic conditions unexpectedly yielded (RS)-5-(N-t-butyloxycarbonylaminomethyl)-3-oxoisoxazolidine-2-carboxamide (8), the structure of which has been confirmed by an X-ray analysis.Elimination of the cyanate ion, which could be trapped with dimethylamine, converted (8) into the corresponding 2-isoxazolin-3-ol derivative (7).Attempts to prepare the individual enantiomers of (8) were unsuccessful.The (R)-(-)-3-hydroxy-4-aminobutyric acid derivative (5) yielded racemic (8).The cyclization reaction of (5) and (4) are believed to involve elimination of toluene-4-sulphonate giving the corresponding α,β-unsaturated ester as an intermediate.

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