A copper-catalyzed regioselective 1,4- and 1,6-conjugate addition of a silyl reagent to diendioates was established. Various 1,4- and 1,6-protosilylation products were obtained in good yields and with high regioselectivity via tuning the ligands used in the reactions. This protocol has provided a simple and efficient method for the synthesis of multisubstituted functionalized allylsilanes.
A novel electrochemical partial fluorination (ECF) of conjugated esters took place and vic-difluorinated products were obtained. The electrolysis was performed under controlled anode potentials. The effects of the supporting electrolyte of Et3N–nHF and solvent on these reactions were examined.
发生了共轭酯的新型电化学部分氟化(ECF),并获得了vic-二氟化产物。电解在受控的阳极电势下进行。研究了Et 3 N– n HF的支持电解质和溶剂对这些反应的影响。
Julia,M. et al., Bulletin de la Societe Chimique de France, 1962, p. 2243 - 2246
作者:Julia,M. et al.
DOI:——
日期:——
Factors which affect the direction of the reaction of nucleophilic addition of CH2XCO2Et to?,?-unsaturated aldehydes in conditions of two-phase catalysis
作者:G. V. Kryshtal'、K. Ya. Burshtein、V. V. Kul'ganek、L. A. Yanovskaya
DOI:10.1007/bf00948847
日期:1984.11
Mechanism of cyclocondensation of isoprenoid acyclic ?,?-enals with monoethyl malonate under the conditions of the Knoevenagel reaction
作者:A. G. Nigmatov、�. P. Serebryakov
DOI:10.1007/bf00961358
日期:1991.5
It was shown that the formation of the di- and trisubstituted derivatives of 1.3-cyclohexadiene-1-carboxylic acid during the condensation of 3-methyl-2-butenal, citral, and farnesal with monoethyl malonate in the presence of secondary amines takes place through the enamines corresponding to these aldehydes, which add to the monoesters of the respective alkenylidenemalonic acids (the "normal" products of the Knoevenagel reaction) by a mechanism of [4 + 2]-cycloaddition. The free carboxyl group in the dienophile is required for the spontaneous transformation of the intermediate [4 + 2]-cycloadducts into the derivatives of cyclohexadiene-1-carboxylic acid in which the catalyst of the process (the secondary amine) is regenerated.