4.8 Article

Concise Total Synthesis of Calothrixins A and B

Journal

ORGANIC LETTERS
Volume 13, Issue 13, Pages 3356-3359

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ol201107a

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Funding

  1. Ministry of Education, Culture, Sports, Sciences and Technology of Japan [22590010]
  2. Grants-in-Aid for Scientific Research [23590143, 23590032, 22590010] Funding Source: KAKEN

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The concise total synthesis of calothrixins A and B has been accomplished by utilizing the one-pot formation of hexatriene as a key intermediate via the palladium-catalyzed tandem cyclization/cross-coupling reaction of triethyl(indo1-2-yl)borate. In another key transformation, the indolo[3,2-j]phenanthridine core was prepared in high yield via Cu(I)-mediated 6 pi-electrocyclization.

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