Polarizing the Nazarov Cyclization: Efficient Catalysis under Mild Conditions
摘要:
Substituted divinyl ketones were studied in the Nazarov cyclization. alpha-Carbomethoxy divinyl ketones underwent efficient Nazarov cyclization with catalytic copper triflate (2 mol %) to give a single cyclopentenone regio- and stereoisomer. The efficiency of the cyclizations correlated with the ability of the substituents to favorably polarize the pi-system of the cationic intermediate.
Polarizing the Nazarov Cyclization: The Impact of Dienone Substitution Pattern on Reactivity and Selectivity
作者:Wei He、Ildiko R. Herrick、Tulay A. Atesin、Patrick A. Caruana、Colleen A. Kellenberger、Alison J. Frontier
DOI:10.1021/ja077162g
日期:2008.1.1
The impact of dienone substitution on the Nazarovcyclization has been examined in detail. Substrates bearing different substituents at each of four positions on the dienone backbone were systematically probed in order to identify trends leading to higher reactivity and better selectivity. Desymmetrization of the pentadienyl cation and oxyallyl cation intermediates through placement of polarizing groups
Two Approaches to the Aromatic Core of the Aminonaphthoquinone Antibiotics
作者:Christopher C. Nawrat、Leoni I. Palmer、Alexander J. Blake、Christopher J. Moody
DOI:10.1021/jo400737f
日期:2013.6.7
Two complementary approaches are presented for the synthesis of the quinone chromophores of the naphthoquinone ansamycins and related natural products. The first involves the use of an improved protocol for the manganese(III) acetate mediated cyclization of 5-aryl-1,3-dicarbonyl compounds to β-naphthols, leading to the simple, scalable preparation of building blocks suitable for the synthesis of naturally
CHUCHOLOWSKI, ALEXANDER W.;CRESWELL, MARK W.;ROTH, BRUCE D.;SLISKOVIC, DR+
作者:CHUCHOLOWSKI, ALEXANDER W.、CRESWELL, MARK W.、ROTH, BRUCE D.、SLISKOVIC, DR+
DOI:——
日期:——
A general synthesis of esters of acryloyl acetic acid and their homologs.
作者:Gilbert Stork、R.Nath Guthikonda
DOI:10.1016/s0040-4039(01)84925-x
日期:1972.1
Polarizing the Nazarov Cyclization: Efficient Catalysis under Mild Conditions
作者:Wei He、Xiufeng Sun、Alison J. Frontier
DOI:10.1021/ja037910b
日期:2003.11.1
Substituted divinyl ketones were studied in the Nazarov cyclization. alpha-Carbomethoxy divinyl ketones underwent efficient Nazarov cyclization with catalytic copper triflate (2 mol %) to give a single cyclopentenone regio- and stereoisomer. The efficiency of the cyclizations correlated with the ability of the substituents to favorably polarize the pi-system of the cationic intermediate.