Stereoselective construction of 3a-methylhydrindanes starting from 2,7-enynol derivatives based on Ti(II)-mediated cyclization and Ru-catalyzed ring-closing metathesis
摘要:
The Ti(II)-mediated cyclization of 3-methyloct-2-en-7-yn-l-ol derivatives 2 proceeded stereoselectively to afford 1-methyl-2-(1-alkylbut-3-enylidene)-1-vinylcyclopentanes 3 after treatment of the resulting alkenyltitaniums with allylbromide in the presence of CuCN, which was readily converted to 3a-methyl-2,3,3a,6-tetrahydro-1H-indenes 1 by the Ru-catalyzed ring-closing metathesis. (c) 2006 Elsevier Ltd. All rights reserved.
Total Synthesis of (±)-Merrilactone A via Catalytic Nazarov Cyclization
作者:Wei He、Jie Huang、Xiufeng Sun、Alison J. Frontier
DOI:10.1021/ja068150i
日期:2007.1.1
The totalsynthesis of merrilactone A (a neurotrophic agent) has been achieved. In the approach reported, simultaneous creation of the C-4 and C-5 stereocenters was accomplished stereospecifically using an unprecedented variant of the Nazarov cyclization. Additional studies focused upon this Lewis acid-catalyzed cyclization of a silyloxyfuran-containing intermediate are presented.
Stereoselective construction of 3a-methylhydrindanes starting from 2,7-enynol derivatives based on Ti(II)-mediated cyclization and Ru-catalyzed ring-closing metathesis
The Ti(II)-mediated cyclization of 3-methyloct-2-en-7-yn-l-ol derivatives 2 proceeded stereoselectively to afford 1-methyl-2-(1-alkylbut-3-enylidene)-1-vinylcyclopentanes 3 after treatment of the resulting alkenyltitaniums with allylbromide in the presence of CuCN, which was readily converted to 3a-methyl-2,3,3a,6-tetrahydro-1H-indenes 1 by the Ru-catalyzed ring-closing metathesis. (c) 2006 Elsevier Ltd. All rights reserved.
Total Synthesis of (±)-Merrilactone A
作者:Wei He、Jie Huang、Xiufeng Sun、Alison J. Frontier
DOI:10.1021/ja0761986
日期:2008.1.1
The totalsynthesis of racemic merrilactone A (a neurotrophic agent) is described, featuring simultaneous and stereospecific creation of the C4 and C5 stereocenters via a notable silyloxyfuran Nazarov cyclization. Full details of the successful synthetic strategy are given, as well as several examples of the interesting reactivity of intermediates that were prepared and studied during the execution