prop-2-yn-1-yl 2-bromobenzoate 在
toluene dioxygenase from E. coli JM109 (pDTG601A) 作用下,
反应 3.0h,
生成 propargyl (5S,6R)-5,6-dihydroxy-2-bromocyclohexa-1,3-dienecarboxylate
参考文献:
名称:
Processing of o-Halobenzoates by Toluene Dioxygenase. The Role of the Alkoxy Functionality in the Regioselectivity of the Enzymatic Dihydroxylation Reaction
摘要:
In order to investigate the relationship between the size of a substituent on the aromatic substrate and its directing effect on the dihydroxylation, a series of 2-halobenzoates was synthesized and subjected to metabolism by toluene dioxygenase in preparative-scale fermentation cultures of Escherichia coli JM109 (pDTG601A). Larger ester substituents were shown to have a greater directing effect on the dihydroxylation reaction. Furthermore, significant increases in regioselectivity were observed using propargyl substituents, relative to the use of any other ester substituent. The selectivity and the product ratios are reported for o-fluoro-, o-chloro-, o-bromo-, and o-iodobenzoate esters (methyl, ethyl, n-propyl, allyl, and propargyl). Experimental and spectral data, as well as absolute stereochemistry, are provided for all new compounds.
2-Phenyl-2-(4-phenyl-1H-1,2,3-triazol-1-yl)ethanol as an Efficient and Versatile Auxiliary Ligand in Copper(II)-Catalyzed Buchwald–Hartwig and Sharpless–Meldal C–N Bond-Forming Reactions
作者:Hashem Sharghi、Pezhman Shiri
DOI:10.1055/s-0034-1379951
日期:——
A highly active, air-stable, and versatile procedure for Buchwald-Hartwig and Sharpless-Meldal C-N bond formation is reported. Under nearly solvent-free conditions using copper(II) acetate and 2-phenyl-2-(4-phenyl-1H-1,2,3-triazol-1-yl)ethanol, a variety of N-heterocycles and various cyclic and noncyclic secondary amines were arylated to form N-aryl compounds in moderate to excellent yields. This methodology also provides rapid access to diverse 1,4-disubstituted 1,2,3-triazoles in good to excellent yields. All reactions are performed in short times under air.
Investigation of the antimicrobial activity of a series of novel derivatives of 1,2,3-triazoles
作者:Kh. Yuldasheva、A. D. Dzhuraev、A. G. Makhsumov、N. Amanov
DOI:10.1007/bf00773202
日期:1992.1
Synthesis and antimicrobial activity of 3,3′-bis-(propyn-1,1′-benzoato)dimethylsilanes
作者:Kh. Yuldasheva、A. D. Dzhuraev、A. G. Makhsumov、N. Amanov
DOI:10.1007/bf00772941
日期:1992.3
Neighboring Carbonyl Group Assisted Oxyacetoxylation of Propargylic Carboxylates with Retention of Chirality under Metal Free Condition
作者:Tapas R. Pradhan、Debendra K. Mohapatra
DOI:10.1002/adsc.201900314
日期:2019.8.5
reaction proceeds through the intramolecular nucleophilic attack of the neighboring carbonyl group on an alkynyliodonium intermediate. The process is general with broad substrate scope and is amenable for application to a variety of propargyl carboxylates including those obtained from naturalproducts. Insight into the mechanistic pathway by isotopic labelling (using H2O18 and D2O) and controlled experiments
提出了保留手性的伯,仲和叔炔丙基羧酸的无金属氧乙酰氧基化方法。该反应通过烷基炔酮中间体上相邻羰基的分子内亲核攻击而进行。该方法是一般的,具有广泛的底物范围,并且适用于包括从天然产物获得的那些炔丙基羧酸酯。通过同位素标记(使用H 2 O 18和D 2 O)洞察机械途径,并确认了对照实验。
Processing of <i>o</i>-Halobenzoates by Toluene Dioxygenase. The Role of the Alkoxy Functionality in the Regioselectivity of the Enzymatic Dihydroxylation Reaction
作者:Jordan Froese、Mary Ann A. Endoma-Arias、Tomas Hudlicky
DOI:10.1021/op400343c
日期:2014.6.20
In order to investigate the relationship between the size of a substituent on the aromatic substrate and its directing effect on the dihydroxylation, a series of 2-halobenzoates was synthesized and subjected to metabolism by toluene dioxygenase in preparative-scale fermentation cultures of Escherichia coli JM109 (pDTG601A). Larger ester substituents were shown to have a greater directing effect on the dihydroxylation reaction. Furthermore, significant increases in regioselectivity were observed using propargyl substituents, relative to the use of any other ester substituent. The selectivity and the product ratios are reported for o-fluoro-, o-chloro-, o-bromo-, and o-iodobenzoate esters (methyl, ethyl, n-propyl, allyl, and propargyl). Experimental and spectral data, as well as absolute stereochemistry, are provided for all new compounds.