Enabling iron catalyzed Doyle–Kirmse rearrangement reactions with in situ generated diazo compounds
作者:Katharina J. Hock、Lucas Mertens、Renè Hommelsheim、Robin Spitzner、Rene M. Koenigs
DOI:10.1039/c7cc02801f
日期:——
Slow addition of sodium nitrite allows the in situ preparation of highly explosive diazo compounds and enables their safe and scalable application in ironcatalyzed rearrangement reactions of allylic and propargylic sulfides. With catalyst loadings as low as 0.1 mol% an effective entry into α-mercapto-nitriles, α-mercapto-esters and α-trifluoromethyl-sulfides on a gram-scale is achieved.
Syntheses of 4-allyl-/4-allenyl-4-(arylthio)-1,4-dihydroisoquinolin-3-ones <i>via</i> the photochemical Doyle–Kirmse reaction
作者:Jianwei Xie、Muhammad Suleman、Zaibin Wang、Xinfei Mao、Beibei Mao、Jiale Fan、Ping Lu、Yanguang Wang
DOI:10.1039/d1ob00859e
日期:——
Facilesynthesis of 4-allyl-/4-allenyl-4-(arylthio)-1,4-dihydroisoquinolin-3-ones via the visible-light-induced Doyle–Kirmse reaction of 4-diazo-1,4-dihydroisoquinolin-3-ones with allyl-/propargyl sulfides is reported. The reaction proceeds via the generation of free carbenes from cyclic diazo compounds followed by in situ formation of sulfonium ylide intermediates, which subsequently undergo [2,3-sigmatropic
Benzo[b]thiophene derivatives and process for preparing the same
申请人:Saitoh Hiroshi
公开号:US06884896B2
公开(公告)日:2005-04-26
The present invention is 3,4-disubstituted-benzo[b]thiophene derivatives represented by general formula (I) and processes for preparing compounds represented by general formula (V) from compounds represented by general formula (IV), preparing a mixture of compounds represented by the following formula (II) and the following formula (III) and preparing the benzo[b]thiophene derivatives represented by the above formula (I):
wherein, R
1
and R
2
represent each a halogen atom, a trihalomethyl group, a C
1-4
alkyl group or a C
1-4
alkoxy group; X represents a hydroxy group or a halogen atom; R
3
and R
4
represent each a hydrogen or a halogen atom, a trihalomethyl group, a C
1-4
alkyl group or a C
1-4
alkoxy group; and R
5
represents a C
1-3
alkyl group or a trifluoromethyl group.
BENZO b]THIOPHENE DERIVATIVE AND PROCESS FOR PRODUCING THE SAME
申请人:TEIJIN LIMITED
公开号:EP1362854A1
公开(公告)日:2003-11-19
The present invention is 3,4-disubstituted-benzo[b]thiophene derivatives represented by general formula (I) and processes for preparing compounds represented by general formula (V) from compounds represented by general formula (IV), preparing a mixture of compounds represented by the following formula (II) and the following formula (III) and preparing the benzo[b]thiophene derivatives represented by the above formula (I).
wherein, R1 and R2 represent each a halogen atom, a trihalomethyl group, a C1-4 alkyl group or a C1-4 alkoxy group; X represents a hydroxy group or a halogen atom; R3 and R4 represent each a hydrogen or a halogen atom, a trihalomethyl group, a C1-4 alkyl group or a C1-4 alkoxy group; and R5 represents a C1-3 alkyl group or a trifluoromethyl group.
The present invention provides 3,4-Disubstituted-benzo[b]thiophene derivatives represented by the following formula (I):
wherein, R1 represents a halogen atom, a trihalomethyl group, a C1-4 alkyl group or a C1-4 alkoxy group; and X represents a halogen atom; with the proviso that the compound is not 3-bromomethyl-4-methoxybenzo[b]thiophene, 3-bromomethyl-4-chlorobenzo[b]thiophene, 3-bromomethyl-4-bromobenzo[b]thiophene or 3-bromomethyl-4-fluorobenzo[b]thiophene.