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133565-44-3

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133565-44-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133565-44-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,5,6 and 5 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 133565-44:
(8*1)+(7*3)+(6*3)+(5*5)+(4*6)+(3*5)+(2*4)+(1*4)=123
123 % 10 = 3
So 133565-44-3 is a valid CAS Registry Number.

133565-44-3Relevant articles and documents

A Total Synthesis of AI-77-B

Ward, Richard A.,Procter, Garry

, p. 3359 - 3362 (1992)

A short total synthesis of AI-77-B (1) is reported, which produces the natural enantiomer using S-leucine and S-aspartic acid as the optically active starting materials. Key words: Natural product; AI-77-B; gastroprotective; total synthesis; enantioselect

Asymmetric michael addition of malonates to enones catalyzed by a primary Β-amino acid and its lithium salt

Yoshida, Masanori,Narita, Mao,Hara, Shoji

, p. 8513 - 8517 (2011/12/03)

Highly enantioselective Michael addition of malonates to enones was achieved using a mixed catalyst consisting of a primary Β-amino acid, O-TBDPS (S)-Β-homoserine, and its lithium salt. Various cyclic and acyclic enones were converted into 1,5-ketoesters in high yields (up to 92%) with high enantioselectivity (up to 97% ee) under mild reaction conditions. Details of synthesis of the catalyst, optimization of the reaction conditions for the Michael addition reaction, and a plausible reaction mechanism are described.

Synthesis of N-urethane protected β-amino alcohols employing N-(protected-α-aminoacyl)benzotriazoles

Sureshbabu, Vommina V.,Sudarshan,Muralidhar,Narendra

, p. 683 - 685 (2008/09/20)

A simple and racemisation-free synthesis of N-urethane protected α-amino/peptidyl alcohols by the reduction of the corresponding easily accessible N-acylbenzotriazoles is described. The method is practical, straightforward, fast and efficient for the synt

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