Cas 135681-45-7,3α,20R-dimethylamino-4,4,14α-trimethyl-9β,19-cyclo-5α-pregnane

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Check Digit Verification of cas no

The CAS Registry Mumber 135681-45-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,5,6,8 and 1 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 135681-45:
(8*1)+(7*3)+(6*5)+(5*6)+(4*8)+(3*1)+(2*4)+(1*5)=137
137 % 10 = 7
So 135681-45-7 is a valid CAS Registry Number.

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135681-45-7Relevant academic research and scientific papers

BUXUS ALKALOIDS. PART XI. THE SYNTHESIS OF CYCLOPROTOBUXINE-A (3β,20S-CHIRALITY) AND ITS TWO ISOMERIC ALKALOIDS WITH 3β,20R- AND 3α,20R- CONFIGURATION FROM LANOSTEROL.

Nakano, Tatsuhiko,Martin, Alfonso,Alonso, Miguel

, p. 2957 - 2968 (2007/10/02)

The synthesis of cycloprotobuxine-A (5), representative of Buxus alkaloids, and its two isomeric alkaloids with 3β,20R- and 3α,20R-configuration, from lanosterol, is described.In order to confirm the stereochemistries at C-3 and C-20 in these three alkaloids, the 3β-dimethylamino-(27) and the 3α-dimethylamino derivative (28) of cycloartanol (24) were also synthesised and their 1H and 13C n.m.r.spectra are discussed.

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