The first uncatalyzed and [Cu(R-box)L-2](SbF6)(2)-catalyzed (1,6}-transannular Gosteli-Claisen rearrangement of cyclic 2-alkoxycarbonyl-substituted allyl vinyl ethers to afford medium- and large-sized carbacycles is disclosed.
relationship studies. Despite the extensive modifications, the binding to nicotinic acetylcholine receptor (nAChR) is in the low micromolar range according to an inhibition assay using 3H-thienylcyclohexyl-piperidine (TCP). A patch clamp functional assay gave comparable results. Compounds exemplified by 16, which consists of a biotinylated ligand linked to a bifunctionalphotoaffinityprobe (BPP), represent
Sustainable, mild and efficient p-methoxybenzyl ether deprotections utilizing catalytic DDQ
作者:Katie Walsh、Helen F. Sneddon、Christopher J. Moody
DOI:10.1016/j.tet.2014.07.003
日期:2014.10
A procedure for the selective deprotection of p-methoxybenzyl ethersusingcatalyticamounts of DDQ and of sodium nitrite, with oxygen as the terminal oxidant, is reported.
Formal Alkyne Aza-Prins Cyclization: Gold(I)-Catalyzed Cycloisomerization of Mixed N,O-Acetals Generated from Homopropargylic Amines to Highly Substituted Piperidines
作者:Cheoljae Kim、Hyo Jin Bae、Ji Hyung Lee、Wook Jeong、Haejin Kim、Vasu Sampath、Young Ho Rhee
DOI:10.1021/ja906744r
日期:2009.10.21
cycloisomerization to access highly substituted piperidines has been developed. By combining a conceptually new way of generating iminium ions using cationic gold(I) complexes and an efficient cyclization reaction that can minimize a potentially competing aza-Cope rearrangement, the proposed reaction successfully circumvents a long-standing problem in the classical aza-Prins reaction. Synthetic utility of the catalytic
The synthesis of a family of bis(binaphthyl)-based compounds for the chiral modification of gold nanoparticle surfaces is described. In these systems, two (S)-1,1′-bi-2-naphthol groups are linked to one another by a single diethanolamine-derived bridge, the nitrogen atom of which serves as an anchor for the attachment of an alkanethiol tether of 6, 10, or 12 methylene units in length. The terminal thiol group allows the production of surface-elaborated gold nanoparticles of 2.1 ± 0.6 nm diameter by a ‘direct synthesis’ method.
The first stereoselective totalsynthesis of antibiotic macrolide Berkeleylactone F is described. The synthetic sequence notably features Sharpless kinetic resolution to access chiral epoxide followed by its regioselective ring-opening reaction, Sharpless asymmetric reaction and ring-closing metathesis.