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158466-54-7

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158466-54-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 158466-54-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,4,6 and 6 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 158466-54:
(8*1)+(7*5)+(6*8)+(5*4)+(4*6)+(3*6)+(2*5)+(1*4)=167
167 % 10 = 7
So 158466-54-7 is a valid CAS Registry Number.

158466-54-7Relevant articles and documents

Total Synthesis of Tautomycin

Oikawa, Masato,Ueno, Tohru,Oikawa, Hideaki,Ichihara, Akitami

, p. 5048 - 5068 (2007/10/02)

A convergent stereocontrolled synthesis of the antifungal antibiotic tautomycin, a potent protein phosphatases inhibitor, has been achieved first via key aldol coupling of two large subunits, a right-hand C1-C21 ketone and a left-hand aldehyde (left from C22).The C1-C10 segment was synthesized through a remote stereochemical control process using a spiroketal template.After joining with the C11-C18 segment, the spiroketal moiety was selectively constructed.Then the right-hand C1-C21 ketone was synthesized via Roush asymmetric crotylboration.The left-hand aldehyde was prepared from a C21-C26 segment and a dialkylmaleic anhydride segment.Completely stereoselective assemblage of the two subunits, the right-hand and the left-hand, was achieved by employing the Mukaiyama aldol reaction.Further functional group manipulation including desilylation, oxidation at C2, and deprotection of tert-butyl ester with concomitant anhydride formation provided tautomycin which was identical with the natural product.As a preliminary study, derivatizations and degradation of the natural product were also examined to support the total synthesis.

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