Novel Shape-Memory Polymer with Two Transition Temperature Based on Two Different Memory Mechanism

As an important kind of intelligent materials, shape-memory materials have been received increasing attention on account of their interesting properties and potential applications in recent years. Particularly, the rise of shape-memory polymers by far surpasses well-known metallic shape-memory alloys in their shape-memory properties. The advantages of polymers compared to other materials are their easier availability and their wide range of mechanical and physical properties. The polymers des…     

Two Brominated-sesquiterpene from Alga Laurencia Majuscula

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒｅｄａｌｇａｏｆｇｅｎｕｓＬａｕｒｅｎｃｉａｉｓｗｅｌｌ ｋｎｏｗｎｔｏｂｅｕｓｅｄｔｏｐｒｏｄｕｃｅｔｅｒｐｅｎｏｉｄｓａｎｄＣ15ａｃｅｔｏｇｅｎｉ ｕｅ[1— 3] .ＷｅｉｎｖｅｓｔｉｇａｔｅｄｔｈｅｔｒｏｐｉｃａｌｒｅｄａｌｇａＬａｕ ｒｅｎｃｉａｍａｊｕｓｃｕｌａ ,ｃｏｌｌｅｔｅｄｆｒｏｍｔｈｅＸｉｓｈａＩｓｌａｎｄｓｉｎｔｈｅＳｏｕｔｈＣｈｉｎａＳｅａ ,ａｎｄｉｓｏｌａｔｅｄｎａｔｕｒａｌｌｙｏｃｃｕｒｒｉｎｇｔｒｉｃｙｃｌｅｓｅｓｑｕｉｔｅｒｐｅｎｅ ,ｐｏｌｙ…     

Two New Eremophilenolides from Ligularia sagitta

Chemical investigation of L.sagitta afforded two new eremophilenolides, which were identified as 6β-angeloyloxy-10β-hydroxy-8 β-methoxy-eremophil-7(11)-en-12, 8α-olide (1) and 6β, 8β-dimethoxy-10β-hydroxy-eremophil-7(11)-en-12, 8α-olide (2). Their structures were estab- lished by spectroscopic methods including 2D NMR experiments.     

Two New Eudesmanoildes from Sonchus transcaspicus

Two new sesquiterpene lactone glycosides were isolated from the whole plant ofSonchus transcaspicus. Their structures were elucidated as 1β--O-β-D-glucopyranosy-5α, 6βH-eudesma-3-en-12, 6αt-olide and 1β--O-β-D-glucopyranosy-15-O-(p-hydroxylphenylacetate)-5α，6β H-eudesma-3, ll(13)-dien-12, 6α-olide by spectral methods (HRMS, 1D and 2D NMR).     

Two New Diterpenoids from Hedychium forrestii

Two new labdane diterpenes isolated from the rhizomes of Hedychium forrestii were determined by spectroscopic evidence to be labda-8(17), 11, 13-trien-7β-hydroxyl- 15(16)-olide (1,hedyforrestin B) and labda-8(17), 11, 13-trien-7β,16-dihydroxyl-16(15)-olide (2, hedyforrestinC).     

Two New Sequiterpenoids from Helicteres angustifolia

A new sesquiterpenoid lactone, 3,6,9-trimethyl-pyrano[2,3,4-de]chromen-2-one (1) and a novel sesquiterpenoid quinone, 6-[2-(5-acetyl-2,7-dimethyl-8-oxo-bicyclo[4.2.0]octa-l,3,5-trien-7-yl)-2-oxo-ethyl]-3,9-dimethylnaphtho[1,8-bc]pyran-7,8-dione (2) together with a known perezone (3) were isolated from the roots of Helicteres angustifolia. The structures were elucidated as mainly on the basis of ID and 2D NMR spectroscopic data.     

Two New Xanthones from Polygala crotalarioides

Two new xanthones, 1,6,8-trihydroxy-2,3-methylenedioxyxanthone 1 and 1,4-dihydroxy-6, 7-methylenedioxyxanthone 2, were isolated from the roots of Polygala crotalarioides. Their structures were elucidated by spectroscopic and chemical methods.     

Two New Diterpenoids from Isodon Lungshengensis

InapreviouspaPer,wehadrcyortedonanew~enod,lungshengeninAl11(3),thefirstenhaUrendforidinwhichtherarebeOxy~sontheA-ring,isedfr0InIsodOnIhagSengensisC.Y.WuetH.W.LLapereInhalhdeofthcLabfor~,whichisdistriedinhagtwcountyoftheboZhUangAutonOInOUSheandisusedasanagatforthetreatIneIItofhrpandsinlocalfOlkmwhcine.theinvestighonofthisplantledtOtheisohaonoftW0newditmpenOdsnamcdaslungsh~B-C(l-2),ThispaPerdealsedthotStrUcturalclucidation.LUngshengedB(l),coloresscubescrystallizedfromcyclohexane,…     

Two New Lignans from Taxus yunnanensis

The phytochemical investigation on the ethanolic extracts of the barks of Taxus yunnanensis (Taxaceae) led to the isolation of two new neo-lignans, named taxuyunins A (1) and B (2), along with the known diterpenolignan, brevitaxin (3). Their structures were elucidated on the basis of spectroscopic and chemical evidences. Compound 1 is a neo-lignan xyloside while compound 2 belongs to the rare neo-lignan possessing a ramified C3 side chain.     

Two New Sesquiterpenes from Ligularia veitchiana

A new furanoeremophilane and a new eudesmane were isolated from the roots of Ligularia veitchiana .Their structures were elucidated as 1 β,10β-epoxy-6β-isobutyryloxy-9-oxo-furanoeremophilane and 8α-hydroxy-4(15),11-eudesmadiene by spectroscopic methods.     

Two New Taxoids from Taxus Yunnanensis

Sincethediscoveryofthefamousanticanceragentpaclitaxel(Taxol@)',muchattentionhasbeenpaidbecauseofitsuniquetubulinactivity',aswellasitsnovelstructure3.Duetothescarcityofpaclitaxel,manykindsofmeasuresincludingsemisynthesis"',totalsynthesis"'andcellculture8havebeentaken.Searchingforpaclitaxelanalogsandprecursorsisthereforeanecessaryinvestigation.ThisledtotheisolationofnumeroustaxoidsfromvariousTaxusspecies'.Asacontinuationofourpreviousstudies"""",wehaveinvestigatedthebarkofTaxusyunnanensis,Cheng…     

Two Novel Cell Division Type PGRs

ＴｗｏＮｏｖｅｌＣｅｌｌＤｉｖｉｓｉｏｎＴｙｐｅＰＧＲｓＬＩＺｈｅｎｇ－ｍｉｎｇ，ＱＩＡＯＬｉ－ｘｉｎ，ＺＨＡＯＺｈｏｎｇ－ｒｅｎａｎｄＬＩＵＴｉａｎ－ｌｉｎ（Ｅｌｅｗｃｏｔｏ－ＯｒｇａｎｉｃＣｈｅｒｎｉｓｔｒｙｉｎｓｔｉｔｕｔｅ，ＮａｎｋａｚＵｎｉ...     

Two Benzyl Dihydroflavones from Phellinus igniarius

Two new bcnzyl dihydroflavones phelligrins A and B were isolated from the fruit body of Phellinus igniarius. Their structrues were identified as 5, 7, 4‘-trihydroxy-6-O-hydroxybenzyl-dihydroflavone and 5, 7, 4‘-trihydroxy-8-O-hydroxybcnzyldihydroflavone, respectively, by means of spectral methods.     

Two New Sesquiterpenes from Ligularia Intermedia

ＴｗｏＮｅｗＳｅｓｑｕｉｔｅｒｐｅｎｅｓｆｒｏｍＬｉｇｕｌａｒｉａＩｎｔｅｒｍｅｄｉａＨｏｎｇＭｉｎｇＣＨＥＮ；ＭｅｎｇＳｈｅｎＣＡＩ＆ＺｈｏｎｇＪｉａｎＪＩＡ（ＳｃｈｏｏｌｏｆＰｈａｒｍａｃｅｕｔｉｃａｌＳｃｉｅｎｃｅｓ，ＢｅｉｊｉｎｇＭｅｄｉｃａ...     

Two New Sesquiterpenes from Ligularia macrophylla

Two new eremophilane sesquiterpenes, 15β-formic ether-6-oxo-furanoeremophilane （1） and 6α, 15β-epoxy eremophila-7（11）-en-8α, 12-olide （2） were isolation from the roots of Ligularia macrophylla. Their structures were deduced from spectroscopic methods and 2D NMR experiments.     

Oxidative Cross-Coupling Reactions between Two Nucleophiles

What is the most favorite and original chemistry developed in your research group?Oxidative Cross-Coupling-The chemistry between two"nucleophiles".How do you get into this specific field?Could you please share some experiences with our readers?My first contact with palladium chemistry was the halopalladation of acetylene in 1998.Then I worked on palladium enolate and found it could initiate a transmetalation reaction.Until 2006,I found that desyl chloride(a halogenated hydrocarbon)showed different reactivity with orga no metallic reagents due to the halophilic and oxyphilic properties,thus we achieved the cross-coupling between two orga no metallic reagents.     

Two New Sesquiterpenes from Inula Japonica

Two new sesquiterpenes were isolaed from the aerial patrs of Inula Japonica.Their structures were eluicated as 1β-hydroxy-8β-acetoxyeostic acid methyl ester and 1β-hydroxy-8β-acetoxyisocostic acid mster by spectral methods.     

Two New Saponins from Lysimachia davurica

Two new saponins named davuricoside I (1) and davuricoside E (2) were isolated from the whole plants ofLysimachia davurica. Their structures were determined by 1D and 2D NMR, FAB-MS techniques, and chemical methods.     

Two New Eremophilenolides from Ligularia tongolensis

Chemical investigation of L. tongolensis afforded two new eremophilenolides, which were identified as 3β-（2＇-methylbutanoyloxy）-8βH-eremophil-7（11）-en-12, 8α（14, 6α）-diolide （1）and 8βH-eremophil-3, 7（11）-dien-12, 8α （14, 6α）-diolide （2）. Their structures were established by spectroscopic methods including 2D NMR experiments.     

Two New Sesquiterpenes from Eupatorium findleyanum

Two new germacrane sesquiterpenes： 3,8,14-trihydroxy- 1 （10）E,4Z, 11 （13）-germacra- trien-12, 6-olide, 8-（2-methyl-4-hydroxyl-2E-butenoyl）, 3,14-diacetoxy （eupalinolide A, 1）, and 3,8,14-trihydroxy-1（10） E, 4E, 11（13）-germacratrien-12,6-olide, 8-2-methyl-4-hydroxyl-2E- butenoyl）, 3,14-diacetoxy （eupalinolide B, 2） were isolated from Eupatorium lindleyanum. Their structures were elucidated by means of ^1H and ^13C NMR spectroscopic analysis, including 2D NMR technique.