Preparation and Crystal Structure of Paeonol

1 INTRODUCTION Paeonol, 2-hydroxyl-4-methoxyacetophenone, is one ofthe main components of Moutan Cortex. It is a traditionalChinese medicine with analgesic, sedative, antiallergic,antioxidative, antinflammatory and antimicrobial proper-ties and used as a remedy for cardiovascular and femalegenital diseases[1～3]. Moreover, it is also a valuableinartificial spicery and can be widely used in domesticchemistry[4]. But the nature of water insolubility and vola-tility makes it difficult for…     

Synthesis and Crystal Structure of Spiro[1-bromo-4-methoxy-5-oxa-6-oxo-bicyclo[3.1.0]hexane-2,2′-（3′- cyclohexanoxy-4′-methoxybutyrolactone]

1INTRODUCTIONThecyclopropane-containingnaturalproductshavereceivedconsiderableattentionassynthetictar-getsastheincorporationofrigidifiedcyclopropylmotifintobioactiveanaloguescanleadtoconfor-mablyconstrainedmolecules[1,.Suchmodifica-2]tionsareexpectedtohavesignificanteffectsonbio-activitieswithconcomitantmedicalimplications.Des-pitethegreatadvancesinthisfield,theefficientsyn-thesisofspiro-cyclopropanecompoundsstillremainsaconsiderablechallenge.Particularnoticeisthede-ficiencyinthepreviousm…     

天然产物5,7-二甲氧基-4′-羟基异黄酮的合成

以4-羟基苯乙酸和3,5-二甲氧基苯酚为原料,通过一条包括苄基化、酰氯化、酯化、氢化、Fries重排、以及Vilsmeier-Haack反应等6步反应的路线合成了天然产物5,7-二甲氧基-4′-羟基异黄酮,目标产物的总收率为33%.利用1HNMR、13C NMR及元素分析确证了化合物的结构.     

Isolation and Crystal Structure of Trans-2,2′,4,4′-tetramethyl-6,6′-dinitro Azobenzene

Trans-2,2′,4,4′-tetramethyl-6,6′-dinitro azobenzene (C16H16N4O4, Mr = 328.32) was isolated from benzene extract of the leaves of Aconitum sungpanense Hand. Mazz. as a new compound, and characterized by spectral methods and X-ray diffraction analysis. It crystallizes in monoclinic system, space group P21/c with a = 8.544(1), b = 13.997(2), c = 7.161(1) A, β = 112.97(1), V = 788.4(2)A3, Z = 4, Dc = 1.383 g/cm3, F(000) = 344 and μ(MoKα) = 0.102 mm-1. The final R = 0.0395 and wR = 0.1140 for 1913 independent reflections with Rint = 0.0109 and 1329 observed reflections with I > 2((I). The molecule is composed of two phenyl rings through trans N=N.     

Isolation and Crystal Structure of 1′,4′-Trans-diol of Abscisic Acid

1 ′,4′-Trans-diol of abscisic acid was isolated from botrytis cinerea as a colorless crystal. The molecular and crystal structures have been determined by X-ray diffraction analysis. It crystallizes in orthorhombic system, space group P212121 with a = 6.724(3), b = 17.559(6), c =12.265(2) (A), a = β = y = 90°, V = 1448.1(8) (A)3, Z = 4, Dx = 1.222 g/cm3, F(000) = 576 and μ(MoKa) = 0.087 mm-1. The final R = 0.0628 and wR = 0.1604 for 2501 independent reflections with Rint = 0.0160 and 1679 observed reflections with I ＞2σ(Ⅰ). There are three intermolecular hydrogen bonds in a unit cell.     

3,5-二羟基-7,4′-二甲氧基黄酮的晶体结构（英文）

从黑沙蒿植物中分离得到3,5-二羟基-7,4′-二甲氧基黄酮,其结构通过核磁共振氢谱、碳谱、X射线单晶衍射进行了表征.该化合物属于三斜晶系,P-1空间群,a=0.479 0(2)nm,b=1.434 5(7)nm,c=2.124 9(10)nm,V=1.429 1(12)nm~3,Z=4,M_r=314.28,D_c=1.461g/cm~3,F(000)=656,μ=0.112mm-1,S=1.088,R_1=0.097 2,wR_2=0.277 7.X射线单晶结构分析表明,两个黄酮分子通过分子间氢键以头-尾相连的方式形成一个共平面的二聚体.     

(±)-3,5-二羟基-7,4′-二甲氧基二氢黄酮醇和(±)-3,5,7-三羟基-4′-甲氧基二氢黄酮醇的全合成

3,5-二羟基-7,4′-二甲氧基二氢黄酮醇(1)从Cephalanthus spathelliferus中分离得到后[1], 又在Haplopappus bayahuen[2]和Lannea coromandelica[3]等植物中被发现, 在印度一直被用于治疗象皮病、阳痿、溃疡、阴道炎、口臭、痢疾和风湿病等. 3,5,7-三羟基-4′-甲氧基二氢黄酮醇(2)首次从Prunus donestica[4]中分离出来后, 又从Salix caprea L., Brazilian propolis中得到. 研究表明, 该化合物具有抗菌、抗肿瘤活性. 我们用与文献[5]类似的方法以2, 4, 6-三羟基苯乙酮和茴香醛为起始原料, 经选择性保护、缩合、环氧化、关环首次完成了化合物(±)-1和(±)-2的全合成. 合成路线如下:     

Synthesis and Crystal Structure of Ethyl 5-Amino-1-[（5′-methyl-1′- t-butyl-4′-pyrazolyl）carbonyl]-3-methylthio-1H-pyrazole-4-carboxylate

1INTRODUCTIONPolarizedketenedithioacetalshavebeenex-tensivelyusedasbuildingblocksinorganicsyn-thesis,especiallyinthesynthesisofheterocycliccompounds[1～6].Pyrazoleanditsderivativesrepre-sentoneofthemostactiveclassesofcompoundspossessingwidespectraofbiologicalactivities.Overthepastfewyears,considerableevidenceshavebeenaccumulatedtodemonstratetheefficacyofpyrazolederivatives,suchasantibacterial[7],fun-gicidal[8],herbicidal[9],insecticidal[10]andotherbiologicalactivities[11,12].Uptonow,alarg…     

Resolution and Crystal Structure of 9α-(3-Azabicyclo[3,3,1]nonanyl)- 2′-cyclopentyl-2′-hydroxyl-2′-thienylacetate

1 INTRODUCTION The design, development and marketing of new chiral drugs are now a major theme in the drug chirality research and industry[1]. In 1996, the FDA announced it would consider further incentives for developing single isomer drugs because of their bet- ter pharmacokinetics prosperity, safety, and tolera- bility. Our recent drug candidate, 9α-(3-azabicyclo- [3,3,1]nonanyl)-2?-cyclopentyl-2?-hydroxyl-2?-thien- ylacetate I, is a potential selective M1 antagonist. It is composed…     

以Heck反应合成（E）-3-甲氧基-4，4′-二羟基二苯乙烯的研究

以香兰素为原料、以Heek反应为关键反应构建两苯环间乙烯桥，经四步反应、以Heek反应75．7％的收率和：50．3％的总收率合成了目标化合物(E)-3-甲氧基-4，4′-二羟基二苯乙烯(1)，并对Heek反应等反应条件进行了探讨．