A Two-Step, Stereoselective Synthesis of Nine- and Ten-Membered Carbocycles from Phthalates
摘要:
A two-step, stereoselective procedure for the synthesis of nine- and ten-membered carbocycles from readily available phthalates is described. A variety of dialkyl phthalates have been transformed into [6,n]-fused bicyclo systems (n = 5, 6, 7) by a dearomatization/cyclization process and then converted into cyclonona- and cyclodecadienes through a bond cleavage reaction, whereby both processes are promoted by alkaline metals in THF.
A Two-Step, Stereoselective Synthesis of Nine- and Ten-Membered Carbocycles from Phthalates
摘要:
A two-step, stereoselective procedure for the synthesis of nine- and ten-membered carbocycles from readily available phthalates is described. A variety of dialkyl phthalates have been transformed into [6,n]-fused bicyclo systems (n = 5, 6, 7) by a dearomatization/cyclization process and then converted into cyclonona- and cyclodecadienes through a bond cleavage reaction, whereby both processes are promoted by alkaline metals in THF.
Dearomatization−Bis-alkylation of Aromatic and Heteroaromatic Diesters Promoted by Me<sub>3</sub>SnLi via a Stanna−Brook Rearrangement
作者:Pablo Monje、Paula Graña、M. Rita Paleo、F. Javier Sardina
DOI:10.1021/ol053130r
日期:2006.3.2
Reaction of Me3SnLi with aromatic and heteroaromatic diesters proceeds through a fast stanna-Brook rearrangement that generates an stable bis-enolate which can be regioselectively alkylated and cyclized, in one step, to bicyclic compounds containing 6,5-, 6,6-, and 6,7-fused ring systems.
Enantioselective Annulation Reactions of Bisenolates Prepared Through Dearomatization Reactions of Aromatic and Heteroaromatic Diesters
作者:Jaime Pérez-Vázquez、Alberte X. Veiga、Gustavo Prado、F. Javier Sardina、M. Rita Paleo
DOI:10.1002/ejoc.201101427
日期:2012.2
A one-pot, enantioselective strategy for the dearomatization–annulation of aromaticdiesters to give a range of highly functionalized polycyclic molecules with excellent enantioselectivity is presented. This methodology is based on the reaction of bisenolates, prepared by treating aromaticdiesters with trialkyltin lithium reagents, which involves a stanna-Brook rearrangement, with 1,ω-dihaloalkanes