FIQ and FIQ2, New Q-site inhibitors for photosynthetic electron transport: synthesis and the relationship between stereochemistry and biological activity
Base‐free Enantioselective C(1)‐Ammonium Enolate Catalysis Exploiting Aryloxides: A Synthetic and Mechanistic Study
作者:Calum McLaughlin、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1002/anie.201908627
日期:2019.10.14
An isothiourea-catalyzed enantioselective Michael addition of aryl ester pronucleophiles to vinyl bis-sulfones via C(1)-ammonium enolate intermediates has been developed. This operationally simple method allows the base-free functionalization of aryl esters to form α-functionalized products containing two contiguous tertiary stereogenic centres in excellent yield and stereoselectivity (all ≥99:1 er)
Catalytic enantioselective synthesis of 1,4-dihydropyridines <i>via</i> the addition of C(1)-ammonium enolates to pyridinium salts
作者:Calum McLaughlin、Jacqueline Bitai、Lydia J. Barber、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1039/d1sc03860e
日期:——
addition of C(1)-ammonium enolates – generated in situ from aryl esters and the isothiourea catalyst (R)-BTM – to pyridinium salts bearing an electron withdrawing substituent in the 3-position allows the synthesis of a range of enantioenriched 1,4-dihydropyridines. This represents the first organocatalytic approach to pyridine dearomatisation using pronucleophiles at the carboxylic acid oxidation level. Optimisation
Cockerill, G. Stuart; Levett, Philip C.; Whiting, Donald A., Journal of the Chemical Society. Perkin transactions I, 1995, # 9, p. 1103 - 1114
作者:Cockerill, G. Stuart、Levett, Philip C.、Whiting, Donald A.
DOI:——
日期:——
FIQ and FIQ2, New Q-site inhibitors for photosynthetic electron transport: synthesis and the relationship between stereochemistry and biological activity
作者:Robert J. Pilling、Donald A. Whiting
DOI:10.1039/a903816g
日期:——
The synthetic hexahydrofuroisoquinoline 4 has, as a mixture of stereoisomers, been identified as a potent and specific inhibitor of electron transport in photosynthesis. We now report that the biological activity of 4 is, surprisingly, independent of configuration at C-1″ and C-2. A new inhibitor 26 has been synthesised, with similar inhibitory activity; the S-enantiomer displays ca. twice the activity of the R-form.
An asymmetric protocol for the synthesis of novel benzofused ϵ-lactones starting from quinone methides and activated acetic acid esters using chiral isothiourea Lewis base catalysts has been developed.
已经开发了一种不对称方案,用于使用手性异硫脲 Lewis 碱催化剂从醌甲化物和活性乙酸酯合成新型苯并化 ε-内酯。