A novel access to α-methylene-γ-sultams via the intramolecularHeckreaction of α-bromovinylsulfonamides derived from allylic amines is reported. These heterocycles are potent Michael acceptors towards sulfur nucleophiles.
An efficient synthesis of rac-trichostatic acid (1) and its analogues Is reported starting from a commercially available aldehyde. Further manipulations of rac-1 led to rac-trichostatin A (TSA). Construction of the desired molecular architecture entails a two-component union, achieved through an in situ hydroboration followed by a Suzuki-Miyaura coupling with 2. The requisite homopropargyl alcohol was synthesized by exploiting allenylindium chemistry. This new protocol paved the way for the synthesis of analogues of trichostatic acid and hence TSA.
Cu-Catalyzed Silylation of Alkynes: A Traceless 2-Pyridylsulfonyl Controller Allows Access to Either Regioisomer on Demand
作者:Alfonso García-Rubia、Jose A. Romero-Revilla、Pablo Mauleón、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1021/jacs.5b02667
日期:2015.6.3
of the reaction, opening the access to either regioisomer without modification of the starting substrate by virtue of an in situ base-promoted alkyne to allene equilibration which takes place prior to the silylcupration process. Furthermore, removal of the directing SO2Py allows for further elaboration of the silylation products. In particular, a one-pot tandem alkyne silylation/allylic substitution