Syntheses and solid state structures of cyclic diynes with two chalcogen centres ? a competition between weak interactions
作者:J. Hilko Schulte、Daniel B. Werz、Frank Rominger、Rolf Gleiter
DOI:10.1039/b303653g
日期:——
Structural investigations by means of X-ray diffraction reveal for most systems a chair-like conformation in the solidstate. For 5S(2)2, 5S(2)3, 7S(2)5, 5Se(2)2 and 5Te(2)3 tubular structures were encountered. These structures can be traced back to weak XX or weak C-Hpi interactions.
termini (lla-i) is described. The methylene groups between the alkyne units vary between n = 12 (a) and n = 4 (i). Ring closing metathesis with Mo(CO) 6 /CF 3 C 6 H 4 OHyielded the monocyclic alkyne 12a with 11a as starting material, whereas 11b-g yielded the cyclic diynes 13b-g. Detailed structural parameters were obtained for 13b and 13c by X-ray crystallography.
描述了在末端 (lla-i) 处具有甲基的 α,ω-二炔的制备。炔烃单元之间的亚甲基在 n = 12 (a) 和 n = 4 (i) 之间变化。用Mo(CO) 6 /CF 3 C 6 H 4 OH进行闭环复分解得到单环炔烃12a,以11a为起始原料,而11b-g得到环状二炔烃13b-g。通过 X 射线晶体学获得了 13b 和 13c 的详细结构参数。
Alkynol natural products target ALDH2 in cancer cells by irreversible binding to the active site
作者:Wolfgang Heydenreuter、Elena Kunold、Stephan A. Sieber
DOI:10.1039/c5cc06424d
日期:——
Chemical proteomic studies reveal ALDH2 as a molecular target of falcarinol in cancer cells.
化学蛋白质组学研究揭示了ALDH2在癌细胞中作为falcarinol的分子靶点。
Total synthesis of two novel brominated acetylenic diols (+)-diplyne C and E: stereoselective construction of the (E)-1-bromo-1-alkene
作者:Benjamin W. Gung、Craig Gibeau、Amanda Jones
DOI:10.1016/j.tetasy.2005.08.019
日期:2005.9
The total syntheses of the enantiomers of two novel brominated polyacetylenic natural products diplynes C and E are reported. Pd and Cu(I)-catalyzed coupling reactions were employed to synthesize the diyne and enyne units. The stereochemistry of the terminal (E)-alkenyl bromide in diplyne C was constructed stereoselectively using Brown’s hydroboration–bromination procedure. The stereochemistry of the
Chemo- and Regioselective Intermolecular Cyclotrimerization of Terminal Alkynes Catalyzed by Cationic Rhodium(I)/Modified BINAP Complexes: Application to One-Step Synthesis of Paracyclophanes
the cationicrhodium(I)/DTBM-Segphos complex. This method can be applied to a variety of terminal alkynes to provide 1,2,4-trisubstituted benzenes in high yield and with high regioselectivity. A chemo- and regioselective intermolecular crossed-cyclotrimerization of dialkyl acetylenedicarboxylates with a variety of terminal alkynes has also been developed based on the use of the cationicrhodium(I)/H8-BINAP