2016 Volume 74 Issue 2 Pages 104-116
A concise synthesis of WIN 64821 (1), eurocristatine (2), 15,15’-bis-epi-eurocristatine (3), ditryptophenaline (4), ditryptoleucine A (6), WIN 64745 (7), cristatumin C (8), asperdimin (9), naseseazine A (10), and naseseazine B (11) is detailed based on a unique bioinspired dimerization reaction of tryptophan derivatives in aqueous acidic solution and one-pot procedure for construction of diketopiperazine rings. Total yields of these alkaloid syntheses were from 10% up to 27%. In addition, 1’-(2-phenylethylene)-ditryptophenaline (5) was synthesized using three one-pot operations. The studies detailed herein provided synthesized natural products for inhibitory activities of ubiquitin-specific protease 7 (USP7) and foam cell formation in macrophages.
