Assembly of Complex Macrocycles by Incrementally Amalgamating Unprotected Peptides with a Designed Four-Armed Insert
作者:Brice H. Curtin、Francesco Manoni、Jiyong Park、Luke J. Sisto、Yu-hong Lam、Michel Gravel、Anne Roulston、Patrick G. Harran
DOI:10.1021/acs.joc.7b02958
日期:2018.3.16
efficiencies and selectivity are also probed. We construct a novel mimic of the second mitochondria derived activator of caspase using these techniques, wherein subtle variations in macrocycle connectivity have a marked impact on performance. In general, the chemistry is an important step toward facile, systematic access to complex peptidomimetics synthesized by directly altering the structure and properties of
Some Reactions of<i>gem</i>-Dibromocyclopropanes and Metal Carbonyls
作者:Shaw-Tao Lin、Chuan-Chen Lee、Mei-Fang Ding、David W. Liang、An-Ting Jeng
DOI:10.1002/jccs.201100375
日期:2012.4
A series of gem‐dibromocyclopropanes were treated with various metal complexes. Among the metal complexes, Ru(CO)2(PPh3)3, Ru(CO)3(PPh3)2, and Mo(CO)6 were able to remove a bromine atom from 1,1‐dibromo‐2‐phenylcyclopropanes (1) to yield a series of corresponding of 1‐bromo‐2‐phenylcyclopropanes (2). Upon the treatment of 1 with Cr(CO)6 in DMSO, a series of allenes were obtained in good yields. The
branched allylsilanes were formed by judicious choice of solvents. Furthermore, branched allylsilanes were obtained with high enantioselectivity (up to 97% enantiomericexcess) with the aid of a C2-symmetric bisphosphine ligand in the unprecedented asymmetric allene hydrosilylation.
One-pot chemoselective functionalization of arylsilanes via cascade metal–metal exchange reactions
作者:Eike Hupe、M. Isabel Calaza、Paul Knochel
DOI:10.1039/b203320h
日期:2002.6.19
A cascade-transmetallation sequence allows a one-pot conversion of arylsilanes into functionalized arylcoppers; they react with various types of electrophiles (allylic halides, acid chlorides, bromoalkynes); bimetallic zincâcopper-reagents can be prepared by this method either directly or in a sequential fashion.
Suzuki–Miyaura Cross Coupling Reactions of B-Allenyl-9-BBN
作者:Karin Radkowski、Günter Seidel、Alois Fürstner
DOI:10.1246/cl.2011.950
日期:2011.9.5
Despite the tremendously wide scope of the palladium-catalyzedSuzuki–Miyauracrosscoupling, boron-based allenylation reactions of aryl halides are virtually unknown. It is now demonstrated that t...