نتایج جستجو برای: organocatalyst
تعداد نتایج: 407 فیلتر نتایج به سال:
Arylidene-Δ2-pyrrolin-4-ones undergo organocatalyzed annulation with malononitrile, furnishing dihydropyrano[3,2-b]pyrroles (18 examples, 0–77% ee in dichloromethane, 11–44% methanol). The products could be enantiomerically enriched by trituration (11 95–99% ee). Enantioselectivity was dependent on the nature of substrate and conformation catalyst, which turn solvent-controlled. reaction mechan...
Abstract The development of a feasible industrial method for poly(ϵ‐caprolactone) (PCL) preparation is great significant and challenging. bulk ring‐opening polymerization ϵ‐caprolactone (ϵ‐CL) using various organic acid catalysts benzyl alcohol (BnOH) as the initiator was developed. Benzoic (BA) has been proved to be an efficient catalyst ROP ϵ‐CL under mild conditions. conversion PCL 84.7 % op...
The frondosins are a family of marine sesquiterpenes isolated from the sponge Dysidea frondosa that exhibit biological activities ranging from anti-inflammatory properties to potential application in anticancer and HIV therapy. Herein, a concise enantioselective total synthesis of (+)-frondosin B is described which requires a total of three chemical steps. The enantioselective conjugate additio...
A new synthetic approach for the production of carbon nanomaterials (CNM) decorated with organophosphorus moieties is presented. Three different triphenylphosphine oxide (TPPO) derivatives were used to decorate oxidized multiwalled carbon nanotubes (ox-MWCNTs) and graphene platelets (GPs). The TPPOs chosen bear functional groups able to react with the CNMs by Tour reaction (an amino group), nit...
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