天然产物系统的生物合成创新是由将新基因和酶招募到这些复杂途径中驱动的。在这里,描述了 curacin A 的聚酮合酶的前所未有的脱羧链终止机制,curacin A 是一种从海洋蓝细菌 Lyngbya majuscula 中分离出来的抗癌先导化合物。对嵌入 CurM 中的包含相邻磺基转移酶 (ST) 和硫酯酶 (TE) 催化结构域的不寻常链终止模块进行了生化表征。TE被证明可以催化聚酮化合物链延长中间体的水解链释放。此外,还发现 (R)-β-羟基的选择性 ST 介导的磺化发生在 TE 介导的水解之前,引发连续的脱羧消除并导致最终代谢物中稀有末端烯烃的形成。
METHOD FOR ENZYMATIC PRODUCTION OF DECARBOXYLATED POLYKETIDES AND FATTY ACIDS
申请人:Sherman David H.
公开号:US20110091952A1
公开(公告)日:2011-04-21
Disclosed herein are methods of preparing alkenes from beta-hydroxy or beta-sulfate carboxylic acid or carboxylic acid derivatives using thioesterase and optionally a sulfotransferase.
Iron(III) p-toluenesulfonate catalyzed synthesis of homoallyl ethers from acetals and aldehydes
作者:Matthew J. Spafford、Erin D. Anderson、Joshua R. Lacey、Ann C. Palma、Ram S. Mohan
DOI:10.1016/j.tetlet.2007.10.026
日期:2007.12
Iron(III) p-toluenesulfonate, Fe(OTs)3·6H2O, is an inexpensive, versatile and commercially available catalyst for the allylation of acetals using allyltrimethylsilane to yield homoallyl ethers in moderate to good yields. The one-pot conversion of aldehydes to homoallyl ethers using alkoxysilanes has also been accomplished using Fe(OTs)3·6H2O as a catalyst. The use of mild reaction conditions and a
Polymer-Supported Dicyanoketene Acetal as a .PI.-Acid Catalyst. Monothioacetalization and Carbon-Carbon Bond Formation of Acetals.
作者:Nobuyuki TANAKA、Tsuyoshi MIURA、Yukio MASAKI
DOI:10.1248/cpb.48.1010
日期:——
Polymeric dicyanoketeneacetals (DCKA) were synthesized by copolymerization of styrene and divinylbenzene or ethylene glycol dimethacrylate. These novel polymers could be used successfully as recyclable pi-acid catalysts in monothioacetalization or carbon-carbon bond forming reaction of acetals.