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1699-40-7

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1699-40-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1699-40-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,9 and 9 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1699-40:
(6*1)+(5*6)+(4*9)+(3*9)+(2*4)+(1*0)=107
107 % 10 = 7
So 1699-40-7 is a valid CAS Registry Number.

1699-40-7Relevant articles and documents

Total synthesis of natural and unnatural lamellarins with saturated and unsaturated D-rings

Ploypradith, Poonsakdi,Petchmanee, Thaninee,Sahakitpichan, Poolsak,Litvinas, Nichole D.,Ruchirawat, Somsak

, p. 9440 - 9448 (2007/10/03)

(Chemical Equation Presented) Twenty-eight natural and unnatural lamellarins with either a saturated or an unsaturated D-ring were synthesized according to our developed synthetic route. The key step involved the Michael addition/ring closure (Mi-RC) of the benzyldihydroisoquinoline and α-nitrocinnamate derivatives, which provided the 2-carboethoxypyrrole intermediates in moderate to good yields (up to 78% yield). Subsequent hydrogenolysis/lactonization furnished lamellarins with a saturated D-ring in excellent yields (up to 93% yield). DDQ oxidation of the saturated lamellarin acetates led directly to the corresponding unsaturated analogues in 54-95% yield. In addition, only two steps in our developed strategy require column chromatography.

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