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141805-86-9

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141805-86-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 141805-86-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,8,0 and 5 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 141805-86:
(8*1)+(7*4)+(6*1)+(5*8)+(4*0)+(3*5)+(2*8)+(1*6)=119
119 % 10 = 9
So 141805-86-9 is a valid CAS Registry Number.

141805-86-9Relevant articles and documents

β-Lactams. 3. Asymmetric Total Syntheis of New Non-Natural 1β-Methylcarbapenems Exhibiting Strong Antimicrobial Activities and Stability against Human Renal Dehydropeptidase-I

Nagao, Yoshimitsu,Nagase, Yunosuke,Kumagai, Toshio,Matsunaga, Hiroshi,Abe, Takao,et al.

, p. 4243 - 4249 (2007/10/02)

Asymmetric synthesis of 11, the precursor to chiral (3R,4R)-3-ethyl>-4-acetoxyazetidin-2-one (3) was achieved by utilizing a highly diastereoselective aldol-type reaction of acetaldehyde and the chiral tin(II) enolate of 5.Similar diastereoselective alkylations of chiral and achiral tin(II) enolates 13a-d with chiral 3 were also performed to obtain the desired alkylated azetidin-2-ones (17a-d).Compounds 17a,b were successfully converted to new, non-natural 1β-methylcarbapenems 1a and 1b, which exhibited strong and wide-ranging antimicrobial activities and excellent stability against human renal dehydropeptidase-I.

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