In-MEDIATED ALLYLATION OF α-KETO ESTERS WITH ALLYL HALIDES<sup>*</sup>
作者:Phil Ho Lee、Kooyeon Lee、Sukbok Chang
DOI:10.1081/scc-100105896
日期:2001.1
The chemoselective reaction of α-keto esters with allyl halides, propargyl bromides, and allenyl bromide using indium metal afforded α-hydroxy-γ,δ-unsaturated esters in good to excellent yields under mild conditions. *This paper is dedicated to Professor Chang Hwan Rhee on the occasion of his 60th birthday.
A Highly Atom Efficient, Solvent Promoted Addition of Tetraallylic, Tetraallenic, and Tetrapropargylic Stannanes to Carbonyl Compounds
作者:Adam McCluskey、I. Wayan Muderawan、Muntari、David J. Young
DOI:10.1021/jo015904x
日期:2001.11.1
Tetraallylic, tetraallenic, and tetrapropargylic stannanes (0.25 equiv) react with aldehydes in methanol to provide unsaturated alcohols in good to excellent yields (56-99%). These reactions proceed exclusively with allylic rearrangement for tetra(2-butenyl)tin 2b and tetra(1,2-butadienyl)tin 16c and predominantly with allylic rearrangement for tetrapropadienyltin 16a and tetra(2-butynyl)tin 6e. Allylation. reactions also proceeded smoothly with reactive ketones such as ethyl pyruvate (9a) and cyclohexanone (9b). The corresponding TFA-catalyzed reactions of dimethyl acetals 4d and 4e are regiospecific with allylic rearrangement.
MAYRARGUE, J.;AVRIL, J. -L.;MIOCQUE, M., BULL. SOC. CHIM. FR., 1984, N 3-4, 129-132
The invention relates to compounds of formula (I), and their use as herbicides. In said formula, R1to R10represent groups such as hydrogen, halo-gen or linear or cyclic organic groups such as alkyl, alkenyl, alkynyl, cycloalkyl, or alkoxy. The invention further refers to a composition comprising such compound and to the use thereof for controlling unwanted vegetation.
Synthesis and structure-activity relationships of acyclic .omega. chain conjugated diene analogs of enisoprost
作者:P. W. Collins、R. L. Shone、W. E. Perkins、A. F. Gasiecki、V. J. Kalish、S. W. Kramer、R. G. Bianchi
DOI:10.1021/jm00082a010
日期:1992.2
of acyclic omega chain conjugateddiene analogues of enisoprost were synthesized and evaluated for gastric antisecretory and diarrheagenic activities in comparison to enisoprost and a previously identified cyclic dienyl analogue. Several novel approaches to the cuprate reagents involved in the synthesis of the series are described. From this SAR study, it appears that both the conjugateddiene and