已经设计了一锅顺序的对羟基苄基化/氧化脱芳香化/螺环化以有效地构建含有螺环-环己二酮的四氢呋喃。这通过在反应进行p的1,3-二酮与-hydroxybenzylation p羟基苄基醇通过醌甲基化物的形成,随后氧化脱芳构化/ spiroannulation与合适的醇。螺[4.5]环己二酮与吲哚的弗里德尔-克来夫茨烷基化反应提供了一系列高度非对映选择性的C-3烷基化螺环和环庚[ b ]吲哚,具体取决于稠合环酮的环大小。
Direct amino acid-catalyzed cascade biomimetic reductive alkylations: application to the asymmetric synthesis of Hajos–Parrish ketone analogues
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1039/b807999d
日期:——
and enantioselective process for the double cascade synthesis of highly substituted 2-alkyl-cyclopentane-1,3-diones, 2-alkyl-3-methoxy-cyclopent-2-enones and Hajos-Parrish (H-P) ketone analogs is presented via reductive alkylation chemistry. For the first time, we have developed a single-step alkylation of cyclopentane-1,3-dione with aldehydes/ketones and a Hantzsch ester through an organocatalytic reductive
Ruthenium-catalysed C-alkylation of 1,3-dicarbonyl compounds with primary alcohols and synthesis of 3-keto-quinolines
作者:Elena Cini、Elena Petricci、Giuseppina I. Truglio、Marialaura Vecchio、Maurizio Taddei
DOI:10.1039/c6ra03585j
日期:——
mono-alkylation of 1,3-diketones using alcohols is possible in the presence of catalytic amounts of Ru(CO)(PPh3)3HCl and 10% mol of the Hantzsch ester. The borrowinghydrogenprocess between the catalyst and the dihydropyridine/pyridine couple prevents the common double alkylation of the Knoevenagel adduct without the need of stoichiometric reducing agents or sacrificial nucleophiles. The reaction was applied to
Design, synthesis and application of spiro[4.5]cyclohexadienones <i>via</i> one-pot sequential <i>p</i>-hydroxybenzylation/oxidative dearomatization
作者:Vaibhav B. Patil、Jagadeesh Babu Nanubolu、Rambabu Chegondi
DOI:10.1039/d1cc01752g
日期:——
p-hydroxybenzylation of 1,3-diketones with p-hydroxybenzyl alcohol via quinone methide formation followed by oxidative dearomatization/spiroannulation with suitable alcohols. The Friedel–Crafts alkylation of spiro[4.5]cyclohexadienones with indoles provided a broad array of highly diastereoselective C-3 alkylated spirocycles and cyclohepta[b]indoles depending upon the ring size of the fused cyclic ketones.
已经设计了一锅顺序的对羟基苄基化/氧化脱芳香化/螺环化以有效地构建含有螺环-环己二酮的四氢呋喃。这通过在反应进行p的1,3-二酮与-hydroxybenzylation p羟基苄基醇通过醌甲基化物的形成,随后氧化脱芳构化/ spiroannulation与合适的醇。螺[4.5]环己二酮与吲哚的弗里德尔-克来夫茨烷基化反应提供了一系列高度非对映选择性的C-3烷基化螺环和环庚[ b ]吲哚,具体取决于稠合环酮的环大小。