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Mo, Juntae,Kang, Dongjin,Eom, Dahan,Kim, Sung Hong,Lee, Phil Ho American Chemical Society 2013 Organic letters Vol.15 No.1
<P>Tandem gold-catalyzed addition of alkynyl phosphonic acid monoethyl esters to terminal alkynes and cyclization were developed for the synthesis of 4,6-disubstituted phosphorus 2-pyrones in one reaction vessel based on the concept of sequential alkyne activation. Alkynyl enol phosphonates were selectively obtained through the gold-catalyzed addition reaction in the presence of a catalytic amount of triethylamine. Also, gold-catalyzed cyclization of alkynyl enol phosphonates was successful in giving a variety of 4,6-disubstituted phosphorus 2-pyrones.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2013/orlef7.2013.15.issue-1/ol3029274/production/images/medium/ol-2012-029274_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol3029274'>ACS Electronic Supporting Info</A></P>
Juntae Mo,황훈,Phil Ho Lee 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
Efficient synthetic method for the preparation of ethyl 2-aryl-2,3-alkadienoates through Pd-catalyzed selective allenyl cross-coupling reactions of aryl iodides with organoindiums generated in situ from indium and ethyl 4-bromo-2-alkynoate was developed. The cyclization reaction of ethyl 2-aryl-2,3-alkadienoates catalyzed by AuCl_3 and AgOTf in the presence of AcOH or TfOH produced various α-aryl γ-butenolides or γ-substituted α-aryl γ-butenolides.
Mo, Juntae,Eom, Dahan,Lee, Euichul,Lee, Phil Ho American Chemical Society 2012 ORGANIC LETTERS Vol.14 No.14
<P>We have developed a hybrid system of metal/Brønsted acid relay catalysis for the intramolecular double hydroarylation and cationic cyclization of diyne diethers and diamines to give 4,4′-bi(2<I>H</I>-chromene), bi(2<I>H</I>-quinoline), and dioxafluoranthenes starting from 2,4-diyne-1,6-diethers and diamines in one reaction vessel under mild conditions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2012/orlef7.2012.14.issue-14/ol301522y/production/images/medium/ol-2012-01522y_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol301522y'>ACS Electronic Supporting Info</A></P>
Mo, Juntae,Choi, Wonseok,Min, Jiae,Kim, Cheol-Eui,Eom, Dahan,Kim, Sung Hong,Lee, Phil Ho American Chemical Society 2013 Journal of organic chemistry Vol.78 No.22
<P>Electrophilic intramolecular twofold iodoarylation was developed from the reaction of diynes and diynyl diethers and amines with iodine monochloride under mild conditions, which produced bis(2<I>H</I>-hydronaphthalene and chromene) and 2<I>H</I>-quinoline bearing an alkenyl iodide moiety in good to excellent yields. These compounds underwent Pd-catalyzed cross-coupling reactions with arylboronic acid and indium tris(arylthiolate) to produce the functionalized styrene derivatives.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/joceah/2013/joceah.2013.78.issue-22/jo401922b/production/images/medium/jo-2013-01922b_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jo401922b'>ACS Electronic Supporting Info</A></P>
Mo, Juntae,Eom, Dahan,Kim, Sung Hong,Lee, Phil Ho The Chemical Society of Japan 2011 Chemistry letters Vol.40 No.9
<P>Pd-Catalyzed carbon–sulfur cross-coupling reactions of aryl chlorides with indium tris(organothiolates) were developed. Aryl chlorides reacted with indium tris(organothiolates) (0.35 equiv) in the presence of 4 mol % of Pd(OAc)<SUB>2</SUB>, 4.2 mol % of Xantphos, and Cs<SUB>2</SUB>CO<SUB>3</SUB> as an additive, producing aryl–aryl and aryl–alkyl sulfides in good to excellent yields.</P>
Eom, Dahan,Mo, Juntae,Lee, Phil Ho,Gao, Zhiming,Kim, Sunggak WILEY‐VCH Verlag 2013 European Journal of Organic Chemistry Vol.2013 No.3
<P><B>Abstract</B></P><P>A synthetic method was developed for the preparation of vinyl sulfides and vinylamines from arylalkynyl phenyl sulfides and sulfonamides. Under mild conditions, a catalytic intramolecular hydroarylation reaction was carried out in the presence of FeCl<SUB>3</SUB> and AgOTf (OTf = trifluoromethanesulfonate) in 1,2‐dichloroethane. A variety of 1,2‐dihydronaphthalenes, 2<I>H</I>‐chromenes, and 1,2‐dihydroquinolines containing a phenylsulfenyl or <I>N</I>‐phenyl‐<I>N</I>‐tosyl group on the sp<SUP>2</SUP>‐hybridized benzylic carbon were prepared in good to excellent yields. The present method could be extended to the preparation of dihydropyrano[2,3‐<I>g</I>]chromenes through a twofold Fe‐catalyzed hydroarylation by a selective 6‐<I>endo</I> mode.</P>