164228-27-7Relevant articles and documents
An efficient synthesis of an 8-phenoxy aporphine derivative utilizing mono-ligated palladium ortho-phenol arylation
Ali, Ghada,Cuny, Gregory D.
, p. 4318 - 4324 (2019)
8-Aryloxy aporphines are a structurally diverse subset of alkaloids that display an array of biological activities. An efficient synthesis of an 8-phenoxy aporphine model compound has been developed utilizing Pictet-Spengler cyclization followed by biaryl bond formation using Pd-XPhos catalyzed ortho-phenol arylation. Biaryl bond formation using direct arylation is also compared. Finally, the stability of the 8-phenoxy aporphine model compound is discussed with potential implications for the isolation, structure elucidation and pharmacognosy of 7-dehydroaporphine natural products.
Introducing catalytic lossen rearrangements: Sustainable access to carbamates and amines
Kreye, Oliver,Wald, Sarah,Meier, Michael A. R.
, p. 81 - 86 (2013/03/13)
A new, highly efficient and environmentally benign catalytic variant of the Lossen rearrangement is described. Dimethyl carbonate (DMC) as green activation reagent of hydroxamic acids in presence of catalytic amounts of tertiary amine bases {1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), 1,8-biazabicyclo 5.4.0 undec-7-ene (DBU), 1,4-diazabicyclo[2.2.2]octane (DABCO), and triethylamine} and small quantities of methanol initiate the rearrangement. Methyl carbamates were obtained in good to moderate yields when aliphatic hydroxamic acids were employed in this catalytic Lossen rearrangement; under the same conditions aromatic hydroxamic acids yielded anilines. Notably, the mixture of DMC/methanol was recycled several times without observing decreased yields, thus minimizing the produced waste. Moreover, several other organic carbonates were successfully employed in the introduced catalytic Lossen rearrangement procedure. Copyright
Iodine (III)-mediated generation of nitrogen-tethered orthoquinol acetates for the construction of oxygenated indole, quinoline, and phenanthridine alkaloid motifs
Pouysegu, Laurent,Avellan, Anne-Virginie,Quideau, Stephane
, p. 3425 - 3436 (2007/10/03)
Functionalized indole and quinoline derivatives are conveniently prepared from nitrogen-tethered 2-methoxyphenols via phenyliodine(III) diacetate mediated oxidative acetoxylation, followed by a fluoride- or base-induced intramolecular nucleophilic addition reaction. This regioselective Michael-type addition step is further discussed in view of the rearrangement of orthoquinol acetate intermediates into paraquinol acetates that is sometimes observed in situ. Application of this methodology to the synthesis of a functionalized phenanthridine, and its potential for the construction of polyoxygenated lycorine-type alkaloid skeleta are here described.
Synthesis of the salutaridine and aporphine skeleton via palladium(0) catalyzed cyclization and S(RN)1 reaction of 2'-bromoreticulines
Wiegand,Schafer
, p. 5341 - 5350 (2007/10/02)
The intramolecular aryl-aryl-coupling reactions of 2'-bromoreticulines are described. Their regioselectivity depends on the cyclization method. The palladium(0) catalyzed reaction of 22 leads preferentially to the salutaridine derivative 27, whilst via the photochemically induced S(RN)1 reaction of 22 the aporphine skeleton 24 is obtained.
