Tandem Phenolic Oxidative Amidation−Intramolecular Diels−Alder Reaction: An Approach to the Himandrine Core
作者:Huan Liang、Marco A. Ciufolini
DOI:10.1021/ol1003669
日期:2010.4.16
An oxidative cyclization of dienic sulfonamides mediated by iodobenzene diacetate in TFA, followed by a tandem intramolecular Die Is Alder reaction, achieves desymmetrization of a "locally symmetrical" dienone with good levels of diastereoselectivity and leads to valuable synthetic intermediates for the himandrine alkaloids.
Oxidative Spirocyclization of Phenolic Sulfonamides: Scope and Applications
作者:Huan Liang、Marco A. Ciufolini
DOI:10.1002/chem.201001402
日期:2010.11.22
A full account of the oxidative dearomatization of para‐ and ortho‐phenolic sulfonamides is provided together with an overview of the chemistry of the products and their elaboration to buildingblocks for spirocyclic alkaloids. A concise total synthesis of putative lepadiformine complements the discussion.
Heck Reaction of Amino Acid Derived Vinyl Substrates in the Synthesis of Homotyrosinol Derivatives
作者:Marco Ciufolini、Huan Liang、Yuan Zhou
DOI:10.1055/s-0029-1218830
日期:2010.8
An avenue to homotyrosinol derivatives through a Heck coupling of 4-iodophenyl acetate with a vinylglycinol derivative required extensive screening of catalysts and conditions. The use of Pd(OAc)2 and N-phenylurea as the ligand ultimately provided excellent results. coupling - Heck reaction - homotyrosine - palladium - N-phenylurea