N-Heterocyclic carbene-catalyzed cascade annulation reaction of o-vinylarylaldehydes with nitrosoarenes: one-step assembly of functionalized 2,3-benzoxazin-4-ones
Rh(III)-Catalyzed Olefination of N-Sulfonyl Imines: Synthesis of Ortho-Olefinated Benzaldehydes
摘要:
Rh(III)-catalyzed olefination of N-sulfonyl imines using acrylates and styrenes has been achieved for the synthesis of ortho-olefinated benaldehydes. This reaction proceeds via a chelation assisted C-H olefination/in situ hydrolysis process.
Flexible, dicationic imidazolium salts for<i>in situ</i>application in palladium-catalysed Mizoroki-Heck coupling of acrylates under aerobic conditions
作者:Marilyn Daisy Milton、Parul Garg
DOI:10.1002/aoc.3503
日期:2016.9
incorporating the features of both bidentate chelating O,O ligand and carbene, shows the maximum catalytic activity. A variety of aryl and heteroaryl methyl and ethyl cinnamates were synthesized using these imidazolium salts as preligands. In addition, NMRstudies confirm in situ generation of normal N‐heterocyclic carbenes from the C‐2 position of imidazol‐2‐ylidene ring. The mercury poisoning test was also
Diastereoselective synthesis of multisubstituted isoindolines via Sequential Ugi and aza-Michael addition reaction
作者:Zhi-Rong Guan、Qin Wan、Ming-Wu Ding
DOI:10.1016/j.tet.2019.07.006
日期:2019.8
A new efficient and diastereoselective synthesis of multisubstituted isoindolines with two stereogenic centers via sequential Ugi/aza-Michael additionreaction was developed. Ugi-3CR of aldehydes 1, amines 2 and isocyanates 3 in the presence of catalytic amount of H3PO4 produced intermediates 4, which were then transformed to isoindolines 5 with good 1,3-trans diastereoselectivity in the presence of
通过连续的Ugi / aza-Michael加成反应,开发了具有两个立体生成中心的多取代异吲哚啉的新的高效非对映选择性合成方法。在催化量的H 3 PO 4存在下,醛1,胺2和异氰酸酯3的Ugi-3CR产生的中间体4,然后在K 2 CO 3存在下,以良好的1,3-反式非对映选择性转化为异吲哚啉5通过分子内氮杂-迈克尔加成。醛1,胺2和三甲基硅烷基叠氮化物的顺序Ugi-叠氮化物和Aza-Michael加成反应6在碳酸钾存在下,还产生了具有良好的1,3-反式非对映选择性的4-四唑基取代的异吲哚啉8。
Piperazine- and piperidine-derivatives as melanocortin receptor agonists
申请人:——
公开号:US20040082590A1
公开(公告)日:2004-04-29
The present invention relates to melanocortin receptor agonists of formula I, which is useful in the treatment of obesity, diabetes and male and/or female sexual dysfunction.
1
本发明涉及公式I的黑素皮质素受体激动剂,可用于治疗肥胖症、糖尿病以及男性和/或女性性功能障碍。
Copper Catalyzed One-Pot Three-Component Imination–Alkynylation–aza-Michael Sequence: Enantio- and Diastereoselective Syntheses of 1,3-Disubstituted Isoindolines and Tetrahydroisoquinolines
作者:Braja Gopal Das、Sadhna Shah、Vinod K. Singh
DOI:10.1021/acs.orglett.9b01507
日期:2019.7.5
An enantio- and diastereoselective syntheses of 1, 3-disubstituted isoindolines and tetrahydroisoquinolines via CuI-Pybox-diPh catalyzed one-pot imination–alkynylation–aza-Michael sequence has been reported. The three-component reaction produces one C–C and two C–N bonds sequentially with high yield (up to 92%), enantioselectivity (up to 99%), and diastereoselectivity (up to 9:1) in a single operation
已经报道了通过Cu I -Pybox-diPh催化的一锅式胺化-炔基化-氮杂-迈克尔序列对1,3-二取代的异吲哚啉和四氢异喹啉的对映体和非对映体选择性合成。三组分反应在一次操作中依次产生一个C–C和两个C–N键,且产率高(高达92%),对映选择性(高达99%)和非对映选择性(高达9:1)。此外,已经通过LiAlH 4的酯还原和炔烃官能度的氢化而不丧失立体选择性证明了该产品的合成效用。
Biogenic synthesis of cellulose supported Pd(0) nanoparticles using hearth wood extract of Artocarpus lakoocha Roxb — A green, efficient and versatile catalyst for Suzuki and Heck coupling in water under microwave heating
for the synthesis of cellulose supported Pd(0) nanoparticles (NPs) using hearth wood extract of Artocarpuslakoocha Roxb-as a bioreductant. Novel one-step method for the isolation of active bioreductant oxyresveratrol (2, 3′, 4, 5′-tetrahydroxy-trans-stilbene) present in the hearth wood extract of A. lakoocha Roxb is also disclosed. Synthesized cellulose supported Pd(0) NPs have been used as an efficient