A Short and Efficient TotalSynthesis of the Naturally Occurring Coumarins Siderin, Kotanin,Isokotanin A and Desertorin C
作者:Michael Müller、Wolfgang Hüttel、Martin Nieger
DOI:10.1055/s-2003-41027
日期:——
Starting from methyl 2-hydroxy-4-methoxy-6-methylbenzoate (6) and its regioisomeric dehydrodimers 7-9,readily available by an oxidative coupling reaction of 6, the naturally occurring coumarins siderin(1), kotanin (2),isokotanin A (3) and desertorin C (4) were synthesized in a novel and highlyefficient three-step transformation. In the case of kotanin (2) both atropisomers were prepared fromthe pure atropisomers of 7.
从 2-羟基-4-甲氧基-6-甲基苯甲酸甲酯(6)及其通过 6 的氧化偶联反应容易获得的regioisomeric dehydrodimers 7-9 开始,通过新颖高效的三步转化法合成了天然香豆素 siderin(1)、kotanin(2)、isokotanin A (3) 和 desertorin C (4)。在柯坦宁(2)中,两种异构体都是由 7 的纯异构体制备的。
GREENHOUSE GAS IMPROVED FERMENTATION
申请人:DSM IP Assets B.V.
公开号:EP3715464A1
公开(公告)日:2020-09-30
The present invention relates to a method for cultivating a microorganism capable of utilizing an organic feedstock, comprising the steps of: (i) cultivating the microorganism in one or more bioreactors (1); (ii) capturing CO2 from the one or more bioreactors (1) and reducing the CO2 to an organic feedstock in a reduction unit (3); and (iii) feeding at least a part of the organic feedstock from the reduction unit (3) into the one or more bioreactors (1).
The present invention relates to a mutant microbial host cell which is deficient in the production of the AgsE protein or in the production of an homologous thereof if compared with a parent microbial host cell which has not been modified and measured under the same conditions. It has been surprisingly found that when the mutant microbial host cell according to the invention is used in a method to produce a compound of interest, for example an enzyme, an improved yield of said compound is obtained if compared to a method in which a parent host cell which has not been modified is used when measured under the same conditions.
The invention provides Bacillus host cell deficient in the production of a neutral protease and of a alkaline protease which host cell comprises a nucleic acid construct, wherein the nucleic acid construct comprises a polynucleotide encoding a compound of interest or encoding a compound involved in the synthesis of a compound of interest operably linked to a promoter sequence allowing for expression of the polynucleotide in the host cell, wherein the promoter comprises a bacteriophage promoter sequence, more preferably a bacteriophage SPO1 promoter sequence. Said host cell can advantageously be used in a method of production of a compound of interest.
The present invention relates to the field of molecular biology and cell biology. More specifically, the present invention relates to a CRISPR-CAS system for a lipolytic yeast host cell.