Synthesis of Functionalized 1,3-Butadienes via Pd-Catalyzed Cross-Couplings of Substituted Allenic Esters in Water at Room Temperature
作者:Daniel J. Lippincott、Roscoe T. H. Linstadt、Michael R. Maser、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1021/acs.orglett.8b01377
日期:2018.8.17
responsible, mild method for the synthesis of functionalized 1,3-butadienes is presented. It utilizes allenic esters of varying substitution patterns, as well as a wide range of boron-based nucleophiles under palladium catalysis, generating sp–sp2, sp2–sp2, and sp2–sp3 bonds. Functional group tolerance measured via robustness screening, along with roomtemperature and aqueous reaction conditions highlight
Unusual regiodivergence in metal-catalysed intramolecular cyclisation of γ-allenols
作者:Jannine L. Arbour、Henry S. Rzepa、Andrew J. P. White、King Kuok (Mimi) Hii
DOI:10.1039/b913295c
日期:——
Different O-heterocycles can be obtained from a common γ-allenol precursor by using Ag, Zn or Sncatalysts; the results were rationalised by molecular modelling.
Asymmetric Gold-Catalyzed Lactonizations in Water at Room Temperature
作者:Sachin Handa、Daniel J. Lippincott、Donald H. Aue、Bruce H. Lipshutz
DOI:10.1002/anie.201404729
日期:2014.9.26
Asymmetric gold‐catalyzed hydrocarboxylations are reported that show broad substrate scope. The hydrophobic effect associated with in situ‐formed aqueous nanomicelles gives good to excellent ee’s of product lactones. In‐flask product isolation, along with the recycling of the catalyst and the reaction medium, are combined to arrive at an especially environmentally friendly process.