从脾菌素和肠菌素的生物合成中发现苄基丙二酰辅酶 A 的形成和选择,揭示了将氨基酸引入聚酮化合物碳支架的通用方法
摘要:
通过生物合成工程选择性修饰碳支架对于聚酮化合物结构多样化很重要。然而,这一范围目前仅限于简单的脂肪族基团,因为 (1) CoA 连接的扩展单元种类有限,缺乏芳香结构和化学反应性,以及 (2) 酰基转移酶 (AT) 特异性窄,仅限于脂肪族 CoA连接的扩展器单元。在本报告中,我们发现并表征了来自链霉菌属中脾脏素和肠毒素的生物合成途径的第一个芳香 CoA 连接的扩展单元苄基丙二酰辅酶 A。CNQ431。其合成采用脱氨/还原羧化策略将苯丙氨酸转化为苄基丙二酰辅酶 A,从而在氨基酸和辅酶 A 连接的扩展单元合成之间建立联系。通过对其选择的表征,我们进一步验证了脾脏的 AT 结构域和抗霉素聚酮化合物合酶能够选择该扩展单元将苯基引入其双内酯支架中。参与形成这种扩展单元的生物合成机制是高度通用的,可以潜在地针对酪氨酸、组氨酸和天冬氨酸进行定制。所公开的芳香族扩展单元、面向氨基酸的合成途径和芳香族选择性 AT
A catalytic method was developed to synthesize thiolesters from the reaction of acyl chlorides and thiols using zinc oxide as a catalyst under solvent-free conditions at room temperature. Mild reaction conditions, short reaction time, excellent yields of products and recyclability of the catalyst are noteworthy features of this methodology.
The moderate reactivity of the alpha,beta-unsaturated thioester (ArS) C(O) C(A)-C(B)(H) toward Pt(PPh3)(2)( C2H4) has been used to extract thermodynamic and kinetic information pertaining to the oxidative addition of alpha,beta-unsaturated acid halide derivatives to low-valent transition-metal complexes. The results indicate acyl platinum product complexes can form by direct C-S bond cleavage or by attack of coordinated Pt(PPh3)(2) on the beta-carbon.
Nickel-Catalyzed C−S Bond Formation via Decarbonylative Thioetherification of Esters, Amides and Intramolecular Recombination Fragment Coupling of Thioesters
A nickelcatalyzed cross‐coupling protocol for the straightforward C−Sbond formation has been developed. Various mercaptans and a wide range of ester and amide substrates bearing various substituents were tolerated in this process which afforded products in good to excellent yields. Furthermore, an intramolecular protocol for the synthesis of thioethers starting from thioesters has been developed
Uncovering the Formation and Selection of Benzylmalonyl-CoA from the Biosynthesis of Splenocin and Enterocin Reveals a Versatile Way to Introduce Amino Acids into Polyketide Carbon Scaffolds
polyketide structural diversification. Yet, this scope is currently restricted to simple aliphatic groups due to (1) limited variety of CoA-linked extender units, which lack aromatic structures and chemical reactivity, and (2) narrow acyltransferase (AT) specificity, which is limited to aliphatic CoA-linked extender units. In this report, we uncovered and characterized the first aromatic CoA-linked
通过生物合成工程选择性修饰碳支架对于聚酮化合物结构多样化很重要。然而,这一范围目前仅限于简单的脂肪族基团,因为 (1) CoA 连接的扩展单元种类有限,缺乏芳香结构和化学反应性,以及 (2) 酰基转移酶 (AT) 特异性窄,仅限于脂肪族 CoA连接的扩展器单元。在本报告中,我们发现并表征了来自链霉菌属中脾脏素和肠毒素的生物合成途径的第一个芳香 CoA 连接的扩展单元苄基丙二酰辅酶 A。CNQ431。其合成采用脱氨/还原羧化策略将苯丙氨酸转化为苄基丙二酰辅酶 A,从而在氨基酸和辅酶 A 连接的扩展单元合成之间建立联系。通过对其选择的表征,我们进一步验证了脾脏的 AT 结构域和抗霉素聚酮化合物合酶能够选择该扩展单元将苯基引入其双内酯支架中。参与形成这种扩展单元的生物合成机制是高度通用的,可以潜在地针对酪氨酸、组氨酸和天冬氨酸进行定制。所公开的芳香族扩展单元、面向氨基酸的合成途径和芳香族选择性 AT