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305806-21-7

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305806-21-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 305806-21-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,5,8,0 and 6 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 305806-21:
(8*3)+(7*0)+(6*5)+(5*8)+(4*0)+(3*6)+(2*2)+(1*1)=117
117 % 10 = 7
So 305806-21-7 is a valid CAS Registry Number.

305806-21-7Relevant articles and documents

Disulfonimide-catalyzed asymmetric synthesis of β3-amino esters directly from N-Boc-amino sulfones

Wang, Qinggang,Leutzsch, Markus,Van Gemmeren, Manuel,List, Benjamin

, p. 15334 - 15337 (2013/11/06)

An asymmetric Mannich reaction of silyl ketene acetals with N-Boc-amino sulfones has been developed. A chiral disulfonimide efficiently catalyzes both the in situ generation of the corresponding N-Boc imines and the asymmetric Mannich reaction with excellent yields and enantioselectivities. Kinetic studies confirm a proposed stepwise mechanism.

Oxazinanones as chiral auxiliaries: Synthesis and evaluation in enolate alkylations and aldol reactions

Davies, Stephen G.,Garner, A. Christopher,Roberts, Paul M.,Smith, Andrew D.,Sweet, Miles J.,Thomson, James E.

, p. 2753 - 2768 (2008/02/10)

Homochiral β-amino esters (prepared on multigram scale by lithium amide conjugate addition) are readily transformed into oxazinanones. N-Acyl derivatives of oxazinanones undergo stereoselective enolate alkylation reactions, with higher stereoselectivities observed for the enolate alkylation of (R)-N-propanoyl-4-iso-propyl-6,6-dimethyl-oxazinan-2-one than the corresponding Evans oxazolidin-2-one. A C(4)-iso-propyl stereodirecting group within the oxazinanone conveys higher stereoselectivity than the analogous C(4)-phenyl substituent. gem-Dimethyl substitution at C(6) within the oxazinanone framework facilitates exclusive exocyclic cleavage upon hydrolysis to furnish α-substituted carboxylic acid derivatives and the parent oxazinanone in good yield. Asymmetric aldol reactions of a range of aromatic and aliphatic aldehydes with the chlorotitanium enolate of (R)-N-propanoyl-4-iso- propyl-6,6-dimethyl-oxazinan-2-one proceed with excellent diastereoselectivity. Hydrolysis of the aldol products affords homochiral α-methyl-β- hydroxy-carboxylic acids. The Royal Society of Chemistry 2006.

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