A convenient route to chiral γ-lactones via asymmetric hydrogenation of γ-ketoesters using the RuCl3–BINAP–HCl catalytic system
摘要:
A convenient one-step synthesis of chiral gamma-lactones has been performed. The method is based on enantioselective hydrogenation of gamma-ketoesters using the RuCl3-BINAP-HCl catalytic system. Chiral gamma-lactones (91-99% ee) have been isolated in 57-88% yield. (C) 2008 Elsevier Ltd. All rights reserved.
A convenient preparation of cyclobutyl ketones: Naphthalene-catalyzed reductive cyclization of substituted 1,4-dihalobutanes
作者:Keith Ramig、Yong Dong、Susan D Van Arnum
DOI:10.1016/0040-4039(95)02194-9
日期:1996.1
Acyl-substituted succinates are useful starting materials for the synthesis of cyclobutyl ketones. The key step, reductivecyclization of the intermediate dihalide, afforded yields of 32–60% of cyclobutyl-containing products.
Efficient C(sp<sup>3</sup>)−H Carbonylation of Light and Heavy Hydrocarbons with Carbon Monoxide via Hydrogen Atom Transfer Photocatalysis in Flow**
作者:Fabian Raymenants、Tom M. Masson、Jesús Sanjosé‐Orduna、Timothy Noël
DOI:10.1002/anie.202308563
日期:2023.9.4
an efficient C−H functionalization process, enabling the regioselective installation of carbonyls in light and heavy hydrocarbons by using inexpensive carbon monoxide. Safe processing of hazardous CO and flammable alkanes is ensured in flow, with high gas-liquid mass transfer rates and fast reaction kinetics. Our method demonstrates the valorization of gaseous reagents, coupling light alkanes, CO, and
我们报告了一种高效的 C−H 官能化过程,通过使用廉价的一氧化碳,能够在轻质和重质烃中选择性安装羰基。具有高气液传质速率和快速反应动力学,可确保危险的 CO 和易燃烷烃的安全加工。我们的方法演示了气态试剂的增值,将轻质烷烃、CO 和烯烃偶联作为末端自由基陷阱。
Herbicidal sulfonamides
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0046677A2
公开(公告)日:1982-03-03
Compounds of the formula:
(wherein A is an unsubstituted or substituted phenyl, phenoxy, pyridyl, furyl or thienyl group; W is 0 or S; X is CH3'C2H5, Cl, OCH3, OC2H6, N(CH3)2 or SCH3; Y is H, CH3 or C2H5 and Z is H or CH3) and the agriculturally suitable salts thereof possess herbicidal activity. They are also of interest as plant growth regulants and may be used to modify plant growth beneficially as well as to selectively control weeds in crops such as wheat, barley, cotton and soybeans. The compounds may be formulated for use in conventional manner.
The compounds may be prepared by a variety of processes e.g. by reacting an appropriately substituted isocyanate or isothiocyanate with an appropriately substituted furo [2,3-d]pyrimidine amine. The furo [2,3-d] pyrimidine amines may be prepared by reaction of an appropriate keto-ester with guanidine carbonate or by reaction of an appropriate dichloropyrimidine with an alkali metal hydroxide.
Compounds corresponding to formula I but in which A represents a benzyl, furyl or thienyl group substituted by a carboxyl or carboxylic acid salt moiety are novel intermediates.
式中的化合物:
(其中 A 是未取代或取代的苯基、苯氧基、吡啶基、呋喃基或噻吩基;W 是 0 或 S;X 是 CH3'C2H5、Cl、O 、OC2H6、N( )2 或 S ;Y 是 H、 或 ,Z 是 H 或 )及其农业上适用的盐类具有除草活性。作为植物生长调节剂,它们也具有重要意义,可用于有益地改变植物生长,以及选择性地控制小麦、大麦、棉花和大豆等作物中的杂草。这些化合物可按常规方法配制使用。
这些化合物可以通过多种工艺制备,例如,将适当取代的异氰酸酯或异硫氰酸盐与适当取代的呋喃 [2,3-d]嘧啶胺反应。呋喃[2,3-d]嘧啶胺可通过适当的酮酯与碳酸胍反应或适当的二氯嘧啶与碱金属氢氧化物反应制备。
对应于式 I 但其中 A 代表被羧基或羧酸盐基取代的苄基、呋喃基或噻吩基的化合物是新型中间体。
Kawenoki, Isabelle; Maurel, Daniele; Kossanyi, Jean, Bulletin de la Societe Chimique de France, 1982, vol. 2, # 11-12, p. 385 - 390
作者:Kawenoki, Isabelle、Maurel, Daniele、Kossanyi, Jean
DOI:——
日期:——
A concise synthesis of highly enantiomerically enriched 2-alkylparaconic acid esters via ruthenium-catalyzed asymmetric hydrogenation of acylsuccinates
作者:Olga V. Turova、Eugenia V. Starodubtseva、Maxim G. Vinogradov、Vladimir A. Ferapontov、Marina I. Struchkova
DOI:10.1016/j.tetasy.2009.09.006
日期:2009.9
The catalytic asymmetric hydrogenation of acylsuccinates using RuCl3 as a precalalyst and atropisomeric diphosphines as chiral auxiliaries allows the synthesis of optically active 2-alkylparaconic acid esters in preparative yields with enantioselectivities up to 99.5% ee. (C) 2009 Elsevier Ltd All rights reserved