Donor−Acceptor Assisted Alkyne Hydration: A Luminescent Boron-Stabilized Enol
摘要:
An alkyne molecule 2-(2'-BMes(2)-phenylethynyl)pyridine (1) that contains a Lewis acidic BMes(2) group and a Lewis basic pyridyl group has been found to undergo facile hydration under ambient conditions in the presence of Cul, forming a highly emissive and stable enol ester (2). The lack of any hydration reactivity by a control compound 2-(2'-BMes(2)-phenylethynyl)benzene (3) under the same conditions supports that the cooperativity between the Lewis donor and acceptor groups plays a key role in the formation of 2.
Double Cyclization/Aryl Migration Across an Alkyne Bond Enabled by Organoboryl and Diarylplatinum Groups
作者:Christina Sun、Zachary M. Hudson、Leanne D. Chen、Suning Wang
DOI:10.1002/anie.201201781
日期:2012.6.4
metals: Diarylacetylenes 1, containing both a boryl (BMes2) group and a diarylplatinumgroup, undergo a transformation involving a double metallocyclization/arylmigration to give tetracycles 2 in high diastereoselectivity (see scheme). This remarkable transformation is enabled by the synergistic interplay of the boryl and the diarylplatinumgroup.