Synthesis of substituted fluorenones and substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes] and their reactivities
摘要:
Several novel 9-fluorenones were synthesized and were used as precursors in an attempt to prepare unique substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes]. Several of the thiiranes were unstable and desulfurized during their preparation (7a-d,11,12). 3',3'-Dichloro(2,5-dimethoxyspiro[fluorene-9,2'-thiirane] (7f) was prepared along with 2,2-dichloro-3,3-bis(4-methoxyphenyl)thiirane (16), and 3',3'-dichloro-10,11-dihydrospiro[5H-dibenzo[a,d]cycloheptane-5,2'-thiirane] (17) all of which were stable at room temperature. A study of the reactivity of fluorenyl-substituted thiiranes and other related thiiranes showed that the extent of aromaticity of the substituents at the 3-position of the thiiranes influences their stabilities.
Synthesis of substituted fluorenones and substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes] and their reactivities
摘要:
Several novel 9-fluorenones were synthesized and were used as precursors in an attempt to prepare unique substituted 3',3'-dichlorospiro[fluorene-9,2'-thiiranes]. Several of the thiiranes were unstable and desulfurized during their preparation (7a-d,11,12). 3',3'-Dichloro(2,5-dimethoxyspiro[fluorene-9,2'-thiirane] (7f) was prepared along with 2,2-dichloro-3,3-bis(4-methoxyphenyl)thiirane (16), and 3',3'-dichloro-10,11-dihydrospiro[5H-dibenzo[a,d]cycloheptane-5,2'-thiirane] (17) all of which were stable at room temperature. A study of the reactivity of fluorenyl-substituted thiiranes and other related thiiranes showed that the extent of aromaticity of the substituents at the 3-position of the thiiranes influences their stabilities.
Unified Protocol for Cobalt-Catalyzed Oxidative Assembly of Two Aryl Metal Reagents Using Oxygen as an Oxidant
作者:Lian-Yan Liao、Kun-Ming Liu、Xin-Fang Duan
DOI:10.1021/acs.joc.5b01787
日期:2015.10.16
reaction of two aryl metal reagents is described. An equivalent amount of two arylGrignard or lithium reagents, after mediation by an equivalent amount of simple ClTi(OEt)3, was facilely assembled under the catalysis of 1 mol % of CoCl2/10 mol % of DMPU using oxygen. The cross-couplings between various aryl metal reagents, especially between two structurally similar arylGrignardreagents, proceeded smoothly