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186417-28-7

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186417-28-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 186417-28-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,4,1 and 7 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 186417-28:
(8*1)+(7*8)+(6*6)+(5*4)+(4*1)+(3*7)+(2*2)+(1*8)=157
157 % 10 = 7
So 186417-28-7 is a valid CAS Registry Number.

186417-28-7Upstream product

186417-28-7Relevant articles and documents

A unified total synthesis of the immunomodulators (-)-rapamycin and (-)-27-demethoxyrapamycin: Assembly of the common C(1-20) perimeter and final elaboration

Smith III, Amos B.,Condon, Stephen M.,McCauley, John A.,Leazer Jr., Johnnie L.,Leahy, James W.,Maleczka Jr., Robert E.

, p. 962 - 973 (2007/10/03)

The potent, naturally occurring immunomodulators (-)-rapamycin (1) and (-)-27-demethoxyrapamycin (2) have been synthesized via a unified and highly convergent strategy. In the preceding paper we discussed the construction of common building blocks A-C and their linkage to provide the C(21-42) segments of 1 and 2. Herein we describe model studies of triene generation and hydroxyl deprotection, the preparation and coupling of building blocks D and E, a two-step protocol for macrocycle formation via union of the ABC and DE subtargets, and completion of the total syntheses. The synthesis of 27-demethoxyrapamycin (2) confirmed the assigned structure.

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