Welcome to LookChem.com Sign In|Join Free

CAS

  • or

623571-21-1

Post Buying Request

623571-21-1 Suppliers

Recommended suppliersmore

  • Product
  • FOB Price
  • Min.Order
  • Supply Ability
  • Supplier
  • Contact Supplier

623571-21-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 623571-21-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,2,3,5,7 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 623571-21:
(8*6)+(7*2)+(6*3)+(5*5)+(4*7)+(3*1)+(2*2)+(1*1)=141
141 % 10 = 1
So 623571-21-1 is a valid CAS Registry Number.

623571-21-1Downstream Products

623571-21-1Relevant articles and documents

Synthesis of the spermidine alkaloids (-)-(2R,3R)- and (-)-(2R,3S)-3-hydroxycelacinnine: Macrocyclization with oxirane-ring opening and inversion via cyclic sulfamidates

Khanjin, Nikolai A.,Hesse, Manfred

, p. 2028 - 2057 (2007/10/03)

The two epimers (-)-1a and (-)-1b of the macrocyclic lactama kaloid 3-hydroxycelacinnine with the (2R,3R) and (2R,3S) absolute configurations, respectively, were synthesized by an alternative route involving macrocyclization with the regio- and stereoselective oxirane-ring opening by the terminal amino group (Schemes 2 and 6). Properly N-protected chiral trans-oxirane precursors provided (2R,3R)-macrocycles after a one-pot deprotection-macrocyclization step under moderate dilution (0.005-0.01M). The best yields (65-85%) were achieved with trifluoroacetyl protection. Macrocyclization of the corresponding cis-oxiranes was unsuccessful for steric reasons. Inversion at OH-C(3) via nucleophilic displacement of the cyclic sulfamidate derivative with NaNO2 led to (2R,3S)-macrocycles. The synthesized (-)-(2R,3S)-3-hydroxycelacinnine ((-)-1b) was identical to the natural alkaloid.

Post a RFQ

Enter 15 to 2000 letters.Word count: 0 letters

Attach files(File Format: Jpeg, Jpg, Gif, Png, PDF, PPT, Zip, Rar,Word or Excel Maximum File Size: 3MB)

1

What can I do for you?
Get Best Price

Get Best Price for 623571-21-1