Mn(III)-based oxidative free-radical cyclizations of γ,γ-bis(allylic) acetoacetates
作者:Mark A. Dombroski、Barry B. Snider
DOI:10.1016/s0040-4020(01)92231-8
日期:1992.2
Oxidative free-radicalcyclizations of γ,γ-(bis)allylic acetoacetates demonstrate that 1,1-disubstituted double bonds are much more reactive than mono- or chloroalkyl-substituted double bonds. The product isolated suggests that bicyclo[3.2.1]octanes 25, 33 and 36 are formed from boat cyclohexyl radical 42 and tandem cyclization products 30, 37 and 38 are obtained from boat cyclohexyl radical 41.
Polymer-supported selenium-induced electrophilic cyclization: solid-phase synthesis of poly-substituted dihydrofurans and tetrahydrofurans
作者:E. Tang、Xian Huang、Wei-Ming Xu
DOI:10.1016/j.tet.2004.08.042
日期:2004.10
Poly-substituted dihydrofurans and tetrahydrofurans have been synthesized through polymer-supported selenium-induced intramolecular electrophilic cyclization, followed by selenoxide syn-elimination or novel nucleophilic substitution cleavage of selenium resin with good yields and purities. (C) 2004 Elsevier Ltd. All rights reserved.
Discovery of orthogonal synthesis using artificial intelligence: Pd(OAc)2-catalyzed one-pot synthesis of benzofuran and bicyclo[3.3.1]nonane scaffolds
作者:Tetsuhiko Takabatake、Keisuke Fujiwara、Sho Okamoto、Ryo Kishimoto、Natsuko Kagawa、Masahiro Toyota
DOI:10.1016/j.tetlet.2020.152275
日期:2020.9
benzofurans 4–6 was explored using the artificial intelligence system SYNSUP. Among the routes proposed by SYNSUP, we investigated a three-stepsynthesis of 7a using methyl 4-ally-3-oxohept-6-enoate (10). A new catalytic reaction was found in which 7a was directly obtained from 10 in a single step with a yield of 24%. It was found that this chemical yield could be increased to 74% when methyl 3-allyl-2-hydroxybenzoate