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1202039-23-3

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1202039-23-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1202039-23-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,0,2,0,3 and 9 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1202039-23:
(9*1)+(8*2)+(7*0)+(6*2)+(5*0)+(4*3)+(3*9)+(2*2)+(1*3)=83
83 % 10 = 3
So 1202039-23-3 is a valid CAS Registry Number.

1202039-23-3Relevant articles and documents

Total synthesis of hygrolines and pseudohygrolines

Liniger, Marc,Estermann, Katja,Altmann, Karl-Heinz

, p. 11066 - 11070 (2013/11/19)

A concise two-step synthesis of all four diastereoisomeric hygrolines ((-)-hygroline (1), (+)-hygroline (2), (-)-pseudohygroline (3), (+)-pseudohygroline (4)) has been developed based on the (-)-sparteine (5)- or (+)-sparteine surrogate 11-mediated enantioselective lithiation of N-Boc pyrrolidine (6), followed by reaction of the chiral anion with (S)- or (R)-propylene oxide. Reduction of the resulting N-Boc amino alcohols furnished hygrolines and pseudohygrolines in 30% to 56% overall yields with dr's > 95:5.

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