35554-98-4Relevant articles and documents
Noncovalently Functionalized Commodity Polymers as Tailor-Made Additives for Stereoselective Crystallization
Wan, Xinhua,Wang, Zhaoxu,Ye, Xichong,Zhang, Jie
supporting information, p. 20243 - 20248 (2021/08/09)
Stereoselective inhibition of the nucleation and crystal growth of one enantiomer aided by “tailor-made” polymeric additives is an efficient method to obtain enantiopure compounds. However, the conventional preparation of polymeric additives from chiral monomers are laborious and limited in structures, which impedes their rapid optimization and applicability. Herein, we report a “plug-and-play” strategy to facilitate synthesis by using commercially available achiral polymers as the platform to attach various chiral small molecules as the recognition side-chains through non-covalent interactions. A library of supramolecular polymers made up of two vinyl polymers and six small molecules were applied with seeds in the selective crystallization of seven racemates in different solvents. They showed good to excellent stereoselectivity in yielding crystals with high enantiomeric purities in conglomerates and racemic compound forming systems. This convenient, low-cost modular synthesis strategy of polymeric additives will allow for high-efficient, economical resolution of various racemates on different scales.
JBIR-78 and JBIR-95: Phenylacetylated peptides isolated from Kibdelosporangium sp. AK-AA56
Izumikawa, Miho,Takagi, Motoki,Shin-Ya, Kazuo
experimental part, p. 280 - 284 (2012/05/19)
The search for metabolites of Kibdelosporangium sp. AK-AA56 resulted in the discovery of novel N-phenylacetylated peptides, JBIR-78 (1) and JBIR-95 (2). Compounds 1 and 2 were established to be N-phenylacetylated heptapeptides by extensive NMR and HRESIMS analyses. The absolute configuration of the standard amino acids including a cysteic acid moiety was determined using Marfey's method on the acid hydrolysates of 1 and 2. The relative and absolute configurations of a nonstandard amino acid, β-hydroxyleucine, were elucidated using the J-based and modified Mosher's methods, respectively. In an antimicrobial test, 1 showed antibacterial activity against Micrococcus luteus.
Alotamide A, a novel neuropharmacological agent from the marine cyanobacterium Lyngbya bouillonii
Soria-Mercado, Irma E.,Pereira, Alban,Cao, Zhengyu,Murray, Thomas F.,Gerwick, William H.
supporting information; experimental part, p. 4704 - 4707 (2009/12/26)
Alotamide A (1), a structurally Intriguing cyclic depsipeptide, was isolated from the marine mat-forming cyanobacterlum Lyngbya bouillonii collected In Papua New Guinea. It features three contiguous peptidic residues and an unsaturated heptaketide with oxidations and methylations unlike those found In any other marine cyanobacterial metabolite. Pure alotamide A (1) displays an unusual calcium influx activation profile In murine cerebrocortical neurons with an EC50 of 4.18 uU.
