A Sequential One-Pot Protocol for the Synthesis of Dihydrobenzo[6,7]indolo-[3′,4′:3,4,5]azepino[2,1-a]isoquinolines Using a Gold-Silver Combined Catalyst
摘要:
A sequential one-pot protocol for the synthesis of indole-based peri-annulated polyheterocycles using trifluoroacetic acid and a gold-silver combined catalyst system is described. The reaction is thought to proceed via an imine formation-cationic pi-cyclization-alkyne activation-intramolecular hydroamination sequence to yield novel dihydrobenzo[6,7]indolo[3',4':3,4,5]azepino[2,1-a]isoquinolines in good yields.
A Sequential One-Pot Protocol for the Synthesis of Dihydrobenzo[6,7]indolo-[3′,4′:3,4,5]azepino[2,1-a]isoquinolines Using a Gold-Silver Combined Catalyst
摘要:
A sequential one-pot protocol for the synthesis of indole-based peri-annulated polyheterocycles using trifluoroacetic acid and a gold-silver combined catalyst system is described. The reaction is thought to proceed via an imine formation-cationic pi-cyclization-alkyne activation-intramolecular hydroamination sequence to yield novel dihydrobenzo[6,7]indolo[3',4':3,4,5]azepino[2,1-a]isoquinolines in good yields.
Chiral Brønsted Acid-Catalyzed Asymmetric Allyl(propargyl)boration Reaction of <i>ortho</i>-Alkynyl Benzaldehydes: Synthetic Applications and Factors Governing the Enantioselectivity
作者:Elsa Rodríguez、Matthew N. Grayson、Amparo Asensio、Pablo Barrio、K. N. Houk、Santos Fustero
DOI:10.1021/acscatal.6b00209
日期:2016.4.1
Chiral Brønstedacid-catalyzed allyl(propargyl)boration of ortho-alkynyl benzaldehydes gives rise to ω-alkynyl homoallylic(homopropargylic)alcohols that can be further transformed to complex molecular scaffolds via subsequent hydroalkoxylation, ring-closing enyne metathesis (RCEYM), or intramolecular Pauson–Khand reaction (PKR). Optimizations of each two-step transformation is reported. A strong dependence
The first transition-metal-free synthesis of 2,3-diarylindenones with tunable selectivity via tandem annulation of 2-alkynylbenzaldehydes with phenols has been developed.