Mild and Phosphine-Free Iron-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides with Alkynyl Grignard Reagents
作者:Chi Wai Cheung、Peng Ren、Xile Hu
DOI:10.1021/ol501087m
日期:2014.5.2
cross-coupling of nonactivated secondary alkylbromides and iodides with alkynyl Grignardreagents at room temperature has been developed. A wide range of secondary alkyl halides and terminal alkynes are tolerated to afford the substituted alkynes in good yields. A slight modification of the reaction protocol also allows for cross-coupling with a variety of primary alkyl halides.
作者:Richard A. Bartsch、Leah P. Bitalac、Charles L. Cowey、Sadik Elshani、Mi-Ja Goo、Vincent J. Huber、Sheryl N. Ivy、Youngchan Jang、Russell J. Johnson、Jong Seung Kim、Elzbieta Luboch、Joseph A. Mcdonough、Michael J. Pugia、Byungki Son、Qiang Zhao
DOI:10.1002/jhet.5570370554
日期:2000.9
Synthetic routes to forty-four dibenzocrown ether alcohols are reported. The new crown ether com pounds are based on a sym-dibenzo-16-crown-5 platform. Most have a hydroxy group and an alkyl, aryl, aralkyl, alkenyl, alkynyl, or perfluoroalkyl group on the central carbon of the three-carbon bridge. Others have substituted benzene rings and either a hydroxy or -O(CH2)nOH group attached to the central
novel Rh‐catalyzed [n+1]‐type cycloadditions of 1,4‐enyne esters, which involve an acyloxy migration as a key step. The efficient preparation of functionalized resorcinols, including biaryl derivatives, from readily available 1,4‐enyne esters and CO was achieved by Rh‐catalyzed [5+1] cycloaddition accompanied by 1,2‐acyloxy migration. When enyne esters had an internal alkyne moiety, the reaction proceeded
我们开发了新颖的1,4-烯炔酯的Rh催化[ n +1]型环加成反应,其中涉及酰氧基迁移是关键步骤。通过Rh催化的[5 + 1]环加成并伴有1,2-酰氧基迁移,可以从容易获得的1,4-烯炔酯和CO中有效制备功能化间苯二酚,包括联芳基衍生物。当烯炔酯具有一个内部炔烃部分时,该反应会通过[4 + 1]型环加成反应进行,涉及1,3-酰氧基迁移,从而生成环戊烯酮。
Multisubstituted N-fused heterocycles via transition metal-catalyzed cycloisomerization protocols
作者:Ilya V. Seregin、Alex W. Schammel、Vladimir Gevorgyan
DOI:10.1016/j.tet.2008.04.023
日期:2008.7
multisubstituted N-fused heterocycles have been developed. It was demonstrated that 1,3-disubstituted N-fused heterocycles, including indolizines, pyrroloquinoxalines, and pyrrolothiazoles can easily be synthesized via an exceptionally mild and efficient method involving a novel silver-catalyzed cycloizomerization of propargyl-containing heterocycles. Alternatively, 1,2-disubstitutedheterocycles can be accessed
New Multicomponent Approach for the Creation of Chiral Quaternary Centers in the Carbonyl Allylation Reactions
作者:Genia Sklute、Ilan Marek
DOI:10.1021/ja060498q
日期:2006.4.1
combined regio- and stereo-controlled carbometalation reaction of alkynyl sulfoxide followed by a zinc homologation and finally an allylation reaction led, in a single-pot operation, to chiral homoallylic alcohols in excellent yields and diastereoselectivities for the creation of chiral quaternary and tertiary centers. The key features in all of the reactions that are described in this article are the high