Alkyl radicals are obtained by photocatalytic oxidation of readily prepared or commercially available zinc sulfinates. The convenient benzylation and alkylation of a variety of electron-poor olefins triggered by the iridium(III) complex 6 Ir[dF(CF3)ppy]2(dtbbpy)PF6 as photocatalyst is described. Moreover, it is shown that zinc sulfinates can be used for facile nonradical sulfonylation reactions with
通过容易制备或可商购的亚磺酸锌的光催化氧化获得烷基。描述了铱(III)配合物6 Ir [dF(CF 3)ppy] 2(dtbbpy)PF 6作为光催化剂引发的各种电子贫乏烯烃的便捷苄基化和烷基化。此外,已表明亚磺酸锌可用于具有高度亲电性的迈克尔受体的容易的非自由基磺酰化反应。
Cyclopropenylcarbinol Derivatives as New Versatile Intermediates in Organic Synthesis: Application to the Formation of Enantiomerically Pure Alkylidenecyclopropane Derivatives
作者:Samah Simaan、Ahmad Masarwa、Elinor Zohar、Amnon Stanger、Philippe Bertus、Ilan Marek
DOI:10.1002/chem.200901074
日期:2009.8.24
The copper‐catalyzed carbomagnesiation (or hydrometalation) reaction of chiralcyclopropenylcarbinolderivatives, obtained by means of a kinetic resolution of secondary allylic alcohols, leads to an easy and straightforward preparation of enantiomericallypurealkylidenecyclopropanederivatives. The reaction mechanism is composed of a syn‐carbometalation followed by a syn‐elimination reaction. To gain
Treat me gently: For a selective synthesis of the unusually sensitive cyclophanic α‐pyrone neurymenolide A, the chosen catalysts must be able to distinguish between six different sites of unsaturation, without scrambling any of the skipped π systems. This challenge was met with a new gold‐catalyzed pyrone synthesis in combination with a molybdenum‐catalyzed ring‐closing alkyne metathesis.
Enantioselective and Diastereodivergent Synthesis of Spiroindolenines via Chiral Phosphoric Acid-Catalyzed Cycloaddition
作者:Thomas Varlet、Mateja Matišić、Elsa Van Elslande、Luc Neuville、Vincent Gandon、Géraldine Masson
DOI:10.1021/jacs.1c04648
日期:2021.8.4
A diastereodivergent and enantioselective synthesis of chiral spirocyclohexyl-indolenines with four contiguous stereogenic centers is achieved by a chiral phosphoric acid-catalyzed cycloaddition of 2-susbtituted 3-indolylmethanols with 1,3-dienecarbamates. Modular access to two different diastereoisomers with high enantioselectivities was obtained by careful choice of reaction conditions. Their functional