One-Pot Zinc-Promoted Asymmetric Alkynylation/Brook-Type Rearrangement/Ene-Allene Cyclization: Highly Selective Formation of Three New Bonds and Two Stereocenters in Acyclic Systems
作者:Polina Smirnov、Jomon Mathew、Anne Nijs、Einat Katan、Miriam Karni、Carsten Bolm、Yitzhak Apeloig、Ilan Marek
DOI:10.1002/anie.201306749
日期:2013.12.16
It's as easy as 1, 2, 3: In a one‐pot sequence, twostereocenters and threenewbonds were created with high selectivity through an asymmetricalkynylation of acyl silanes, a tandem Brook‐type rearrangement and Zn–ene–allene cyclization, the addition of an electrophile, and finally oxidation (see scheme). The straightforward nature of the synthetic procedure contrasts strongly with the complexity of
New acyl(allyl)- and acyl(vinyl)silanes have been synthesized in order to explore cross metathesis or ring-closing metathesis as a new way towards bis(acyl)silanes or unsaturated cyclic acylsilanes, respectively. Metathesis from acylsilanes did not work but their precursors, in particular in benzotriazol series, proved to be good candidates. Two new benzotriazolyl substituted silacyclic compounds (tetrahydrosiline
New 6-oxa-2-silabicyclo[2.2.0]hexanes by photochemical conversion of acyl(allyl)(dimethyl)silanes
作者:Catherine Hammaecher、Charles Portella
DOI:10.1039/b812550c
日期:——
Under UV irradiation in acetonitrile, acyl(allyl)silanes undergo an intramolecular (2+2) cycloaddition (Paternò-Büchi type reaction) to give unprecedented 1-alkyl-6-oxa-2-silabicyclo[2.2.0] hexanes.