A CONVENIENT SYNTHESIS OF 2-AMINO-5,6,7,8,-TETRAHYDRO-5-OXO-4-ARYL-7,7-DIMETHYL-4H-BENZO-[b]-PYRAN-3-ETHYLCARBOXYLATES UNDER MICROWAVE IRRADIATION
摘要:
A series of 2-amino-5,6,7,8-tetrahydro-5-oxo-4-aryl-7,7-dimethyl-4H-benzo-[b]-pyran-3-ethylcarboxylates were synthesized by reaction of beta -cyano-beta -carbothoxy styrene and 5,5-dimethyl-1,3-cyclo-hexanedione under microwave irradiation without catalyst and solvent.
Catalyst Free One-pot Three-component Synthesis of 2-Amino-4Hchromene Derivatives in Aqueous Deep Eutectic Mixture at Room Temperature
作者:Atul Chaskar
DOI:10.2174/1570178611666140210213413
日期:2014.4
Multifunctional chromenes have been efficiently synthesized in aqueous medium at room temperature using
deep eutectic mixture of choline chloride:urea. In this one-pot synthesis, the benzylidenemalononitrile firstly formed by
Knoevenagel condensation of aldehyde and malononitrile eventually underwent Michael addition-cyclization with dimedone
and offered the chromenes in good to excellent yield.
A nano-organo catalyzed route towards the efficient synthesis of benzo[b]pyran derivatives under ultrasonic irradiation
作者:Ridaphun Nongrum、Geetmani Singh Nongthombam、Mattilang Kharkongor、Jims World Star Rani、Noimur Rahman、Chingrishon Kathing、Bekington Myrboh、Rishanlang Nongkhlaw
DOI:10.1039/c6ra24108e
日期:——
reaction time and use of green solvents. Ultrasound energy has been meticulously exploited for the synthesis of a nano-organocatalyst as well as for the preparation of several benzo[b]pyranderivatives. The biological activity of the synthesized benzo[b]pyrans were investigated and one of the derivatives was found to demonstrate profound activity in suppressing the side-effects of chlorpyrifos, an insecticide
本文报道了在超声条件下由维生素B 1官能化的Fe 2 O 3 @SiO 2 NPs催化的高效一锅合成苯并[ b ]吡喃。纳米有机催化剂的合成和表征通过FT-IR,TEM,EDS,粉末X射线衍射,等等若干苯并[ b以令人满意的产率制备了]吡喃衍生物,并且磁性回收和再循环了纳米催化剂。该方案的显着特征包括方便的后处理程序,温和的反应条件,容易的催化剂回收,较短的反应时间和绿色溶剂的使用。超声波能量已经被精心开发用于合成纳米有机催化剂以及制备几种苯并[ b ]吡喃衍生物。合成的苯并[生物活性b ]吡喃进行了调查和衍生物中的一种被发现表现出在抑制毒死蜱的副作用,对的外部鳃的形态杀虫剂深刻活性黑眶蟾蜍蝌蚪。
A new approach for the synthesis of biologically active chromene compounds using a photo catalyst TiO<sub>2</sub>-Ag
(EDS), and powder XRD technique and thermogravimetric analysis (TGA). In addition, the in-vitro study of helminths against S. obvelata were investigated and it was found that chromene derivatives were active against S. obvelata and showed no sign of acute toxicity in mice.
1,4-Diazabicyclo[2.2.2]octane as an Efficient Catalyst for a Clean, One-Pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives via Multicomponent Reaction in Aqueous Media
作者:Daryoush Tahmassebi、Jessica A. Bryson、Sophia I. Binz
DOI:10.1080/00397911.2010.515345
日期:2011.9.15
mild and efficient catalyst for the synthesis of various tetrahydrobenzo[b]pyranderivatives via a one-pot, three component condensation of aromatic aldehydes, dimedone, and active methylene compounds. This method provides several advantages: a simple workup procedure, environmental friendliness, neutral conditions, and good yields. In addition, water or 50% aqueous ethanol was chosen as a green solvent
(2021). Solar Energy Mediated Green Synthesis of Tetrahydrobenzo[b]pyrans Using L-Ascorbic Acid as an Organocatalyst in Aqueous Medium. Organic Preparations and Procedures International: Vol. 53, No. 5, pp. 441-454.