Complementary regioselective cyclopropyl ring openings of 6-formyl-spirobicyclo[5.2]octane mediated by TMSCl and TBAI
摘要:
Absolute control over the regioselectivity of trimethylsilyl halide-induced cyclopropane fragmentation of a spirofused cyclopropyl carboxaldehyde has been achieved by simply varying the reaction stoichiometry and the nature of the halide. Treatment of 6-formyl-spirobicyclo[5.2] octane with a large excess of TMSCl gave 3-(1-chlorocyclohexyl)propanal (84% yield), whereas 2-(1-iodomethylcyclohexyl)ethanal (86% yield) was obtained using 10 equivalents each TMSCl and n-Bu4NI (TBAl). Use of only a moderate excess of TMSCl or TMSCl and TBAl gave the rearranged product 3-(1-cyclohexenyl)-propanal. (C) 1997 Elsevier Science Ltd.
Amide-Group-Directed Protonolysis of Cyclopropane: An Approach to 2,2-Disubstituted Pyrrolidines
作者:Marija Skvorcova、Aigars Jirgensons
DOI:10.1021/acs.orglett.7b00584
日期:2017.5.19
Regioselective protonolytic C–C bond cleavage of acylated aminomethyl cyclopropanes can be achieved using trifluoroacetic acid. The intermediate tertiary carbenium ion undergoes an intramolecular amination to give 2,2-substituted pyrrolidines. The strength of the acid and the amine substituent are important factors to achieve high regioselectivity, suggesting intramolecular proton transfer from the
[EN] PURINE INHIBITORS OF HUMAN PHOSPHATIDYLINOSITOL 3-KINASE DELTA<br/>[FR] INHIBITEURS PURIQUES DE LA PHOSPHATIDYLINOSITOL 3-KINASE DELTA HUMAINE
申请人:MERCK SHARP & DOHME
公开号:WO2014075393A1
公开(公告)日:2014-05-22
The instant invention provides compounds of formula I which are PI3K-delta inhibitors, and as such are useful for the treatment of PI3K-delta-mediated diseases such as inflamation, asthma, COPD and cancer.
PURINE INHIBITORS OF HUMAN PHOSPHATIDYLINOSITOL 3-KINASE DELTA
申请人:Merck Sharp & Dohme Corp.
公开号:EP2920172A1
公开(公告)日:2015-09-23
Amination of Carbenium Ions Generated by Directed Protonolysis of Cyclopropane
作者:Marija Skvorcova、Lukass T. Lukasevics、Aigars Jirgensons
DOI:10.1021/acs.joc.8b02576
日期:2019.4.5
Directed intramolecular protonolyis of the cyclopropane C–C bond is demonstrated as a strategy to generate carbenium ions. This intermediate can be subjected to amination with nitriles under Ritter reaction conditions. Directing groups such as carbamate, carboxamide, urea, ester, and ketone were found to be efficient for regioselective anti-Markovnikov cleavage of cyclopropane. Depending on the directing
Complementary regioselective cyclopropyl ring openings of 6-formyl-spirobicyclo[5.2]octane mediated by TMSCl and TBAI
作者:He Huang、Craig J. Forsyth
DOI:10.1016/s0040-4020(97)01019-3
日期:1997.12
Absolute control over the regioselectivity of trimethylsilyl halide-induced cyclopropane fragmentation of a spirofused cyclopropyl carboxaldehyde has been achieved by simply varying the reaction stoichiometry and the nature of the halide. Treatment of 6-formyl-spirobicyclo[5.2] octane with a large excess of TMSCl gave 3-(1-chlorocyclohexyl)propanal (84% yield), whereas 2-(1-iodomethylcyclohexyl)ethanal (86% yield) was obtained using 10 equivalents each TMSCl and n-Bu4NI (TBAl). Use of only a moderate excess of TMSCl or TMSCl and TBAl gave the rearranged product 3-(1-cyclohexenyl)-propanal. (C) 1997 Elsevier Science Ltd.