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1187921-84-1

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1187921-84-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1187921-84-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,8,7,9,2 and 1 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1187921-84:
(9*1)+(8*1)+(7*8)+(6*7)+(5*9)+(4*2)+(3*1)+(2*8)+(1*4)=191
191 % 10 = 1
So 1187921-84-1 is a valid CAS Registry Number.

1187921-84-1Upstream product

1187921-84-1Relevant articles and documents

Synthesis of racemic and chiral Carvedilol starting from corresponding 5-(chloromethyl)oxazolidin-2-one

Anand Kumar,Veera Babu,Rao, Rama Koteshwar,Srinivas, Kumbam,Madhusudhan,Mukkanti

, p. 1430 - 1435 (2012/11/06)

The synthesis of racemic Carvedilol ((±)-1) has been achieved starting from 2-(chloromethyl) oxirane ((±)-2) in a four-step sequence. 5-(Chloromethyl) oxazolidin-2-one ((±)-3) and 5-((9Hcarbazol-4-yloxy) methyl) oxazolidin-2-one ((±)-4) are intermediates. A similar sequence starting from (R)- or (S)-2-(chloromethyl)oxirane 2 give corresponding chiral 5-((9Hcarbazol-4-yloxy)methyl) oxazolidin-2-one 4 followed by chiral Carvedilol 1. The synthetic sequence followed avoids the formation of impurity B (bis impurity). This approach can be useful for the preparation of pharmaceutically important moieties containingβ-amino alcohols without formation of bis impurity.

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