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- Title
Scalable Total Syntheses and Structure–Activity Relationships of Haouamines A, B, and Their Derivatives as Stable Formate Salts.
- Authors
Tsukamoto, Hirokazu; Nakamura, Saki; Tomida, Akito; Doi, Takayuki
- Abstract
Haouamines A, B, and their derivatives were synthesized via Suzuki–Miyaura coupling and three key cyclization reactions as follows: the newly developed palladium(0)‐catalyzed arylative cyclization of phenylalanine‐derived alkyne–aldehydes with 2‐bromoarylboronic acid (an "anti‐Wacker"‐type cyclization); BF3⋅OEt2‐promoted Friedel–Crafts‐type cyclization of symmetrical electron‐rich aromatic rings adjacent to a tertiary allylic alcohol leading to the indeno‐tetrahydropyridine skeleton; and (cyanomethyl)trimethylphosphonium iodide‐mediated macrocyclization of amino alcohols to afford aza‐paracyclophane precursors. The palladium‐catalyzed reduction of mono‐ and di‐triflate intermediates in the later stages enabled the alteration of both the position and number of hydroxyl groups on the C‐ring. The instability of haouamine B was dramatically improved by salt formation with formic acid. An unambiguous evaluation of the cytotoxicity of the prepared haouamine derivative formates with and without hydroxyl groups at different positions on the C‐ring indicated that the catechol structure in haouamine B produced weak cytotoxicity.
- Subjects
STRUCTURE-activity relationships; AROMATIC aldehydes; AMINO alcohols; HYDROXYL group; SALTS; ALLYL alcohol; CATECHOL
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 55, p12528
- ISSN
0947-6539
- Publication type
Academic Journal
- DOI
10.1002/chem.202001756