Efficient palladium-catalyzed C(sp<sup>2</sup>)–H activation towards the synthesis of fluorenes
作者:Juan Song、Yali Li、Wei Sun、Chenglong Yi、Hao Wu、Haotian Wang、Keran Ding、Kang Xiao、Chao Liu
DOI:10.1039/c6nj02033j
日期:——
protocol for the synthesis of fluorene derivatives has been developed through palladium-catalyzed cyclization of 2′-halo-diarylmethanes via activation of arylic C–H bonds. The reactions occurred smoothly and allowed both electron-rich and electron-deficient substrates to convert into their corresponding fluorenes in good to excellent yields. Studies revealed that this Pd-catalyzedcyclization was also available
have been synthesized through an efficient novel Pd‐catalyzed tandem cross‐coupling reaction; these substrates are fascinating building blocks found in organic photoelectric materials. The position of the substituent on fluorenes could be conveniently tuned by changing the halogen in the ortho‐halobenzyl bromide substrates when coupled with various arylboronic acids. This newly developed synthetic approach
.alpha.,.alpha.-disubstituted aromatics and heteroaromatics as cognition
申请人:The DuPont Merck Pharmaceutical Co.
公开号:US05173489A1
公开(公告)日:1992-12-22
Cognitive defeciencies or neurological dysfunction in mammals are treated with .alpha.,.alpha.-disubstituted aromatic or heteroaromatic compounds. The compounds have the formula: ##STR1## or a salt thereof wherein X and Y are taken together to form a saturated or unsaturated carbocyclic or heterocyclic first ring and the shown carbon in said ring is .alpha. to at least one additional aromatic ring or heteroaromatic ring fused to the first ring; one of Het.sup.1 is 2, 3 or 4-pyridyl or 2, 4, or 5-pyrimidinyl and the other is selected from (a) 2, 3, or 4-pyridyl, (b) 2, 4, or 5-pyrimidinyl, (c) 2-pyrazinyl, (d) 3, or 4-pyridazinyl, (e) 3, or 4-pyrazolyl, (f) 2, or 3-tetrahydrofuranyl, and (g) 3-thienyl.
A method of obtaining information about a chemically active area of a target molecule, for example for drug discovery, comprising: providing a set of substantially rigid chemical gauges; reacting said target with a plurality of gauges of said set of gauges, assaying a binding of said gauges with said target to obtain a plurality of assay results; and analyzing said assay results to obtain information about said chemically active area.