Radical cyclization of allyl α-bromocarboxylates into λ-butyrolactones. Effect of the ester structure on the cyclization
作者:A. B. Terent'ev、T. T. Vasil'eva、N. A. Kuz'mina、N. S. Ikonnikov、S. A. Orlova、E. I. Mysov、Yu. N. Belokon'
DOI:10.1007/bf02495259
日期:1997.12
Allyl dibromoacetate, allyl α-bromopropionate, and allyl phenylbromoacetate undergo cyclization in benzene in the presence of increased concentration of Fe(CO)5—DMF as the initiating system to give the corresponding bromo-substituted butyrolactones.
X is O or S;
n is 0 or 1;
R is H, Cl, F, Br, CH₃, OCH₃ or OCH₂CH₃;
R is C₁-C₃ alkyl, allyl or propargyl;
R₂ is X₁R₈ or OH;
R₃ is Cl, F, Br or CF₃;
R₄ is H, Cl, F or Br;
R₅ is CF₃;
R₆ is H or Cl;
R₇ is H, Cl, F, Br or CF₃;
R₈ is an organic group of defined structure;
X₁ is O or S;
and their agriculturally suitable salts, exhibit herbicidal activity, especially for the control of weeds in rice.
X 是 O 或 S
n 是 0 或 1;
R 是 H、Cl、F、Br、CH₃、OCH₃ 或 OCH₂CH₃;
R₁-C₃ 烷基、烯丙基或丙炔基;
R₂ 是 X₁R₈ 或 OH;
R₃ 是 Cl、F、Br 或 CF₃;
R₄ 是 H、Cl、F 或 Br;
R₅ 是 CF₃;
R₆ 是 H 或 Cl;
R₇ 是 H、Cl、F、Br 或 CF₃;
R₈ 是定义结构的有机基团;
X₁ 是 O 或 S;
及其农业上适用的盐类具有除草活性,特别是在控制水稻杂草方面。
Enzymatic synthesis of phenolic acid esters and steryl phenolates
申请人:ETH Zurich
公开号:EP2886657A1
公开(公告)日:2015-06-24
The present invention relates to a method for obtaining at least one steryl phenolate from at least one phenolic acid in an enzymatic process using a lipase, wherein in a first step a) the at least one phenolic acid and at least one alcohol R1-OH undergo an enzymatic esterification to at least one phenolic acid ester according to reaction scheme (III)
, and in at least one second step b) the at least one phenolic acid ester and at least one sterol R2-OH undergo an enzymatic transesterification using a lipase to at least one steryl phenolate according to reaction scheme (IV)