A Switchable Domino Process for the Construction of Novel CO
<sub>2</sub>
‐Sourced Sulfur‐Containing Building Blocks and Polymers
作者:Farid Ouhib、Bruno Grignard、Elias Van Den Broeck、André Luxen、Koen Robeyns、Veronique Van Speybroeck、Christine Jerome、Christophe Detrembleur
DOI:10.1002/anie.201905969
日期:2019.8.19
α‐Alkylidene cyclic carbonates (αCCs) recently emerged as attractive CO2‐sourced synthons for the construction of complex organic molecules. Herein, we report the transformation of αCCs into novel families of sulfur‐containingcompounds by organocatalyzed chemoselective addition of thiols, following a domino process that is switched on/off depending on the desired product. The process is extremely
Synthesis of acetylenic alcohols with calcium carbide as the acetylene source
作者:Yin Ngai Sum、Dingyi Yu、Yugen Zhang
DOI:10.1039/c3gc41269e
日期:——
Propargyl alcohols containing a terminal alkyne group are highly important and versatile intermediates. Here, we report the synthesis of these compounds from an inexpensive and renewable resource, calcium carbide (CaC2). No metal catalysts are required in this new protocol and the reactions take place under very mild conditions.
The first general and regioselective Pd‐catalyzed cyclocarbonylation to give α‐methylene‐β‐lactones is reported. Key to the success for this process is the use of a specific sterically demanding phosphine ligand based on N‐arylated imidazole (L11) in the presence of Pd(MeCN)2Cl2 as pre‐catalyst. A variety of easily available alkynols provide under additive‐free conditions the corresponding α‐methylene‐β‐lactones