A silver-catalyzed stereoselective domino cycloisomerization–vinylogous aldol reaction of ortho-alkynylbenzaldehydes with 3-alkylidene oxindoles: an entry to functionalized isochromenes
Bismuth Triflate-Catalyzed Vinylogous Nucleophilic 1,6-Conjugate Addition of <i>para</i>-Quinone Methides with 3-Propenyl-2-silyloxyindoles
作者:Kai-Xue Xie、Zhi-Pei Zhang、Xin Li
DOI:10.1021/acs.orglett.7b03433
日期:2017.12.15
A highlydiastereoselective vinylogous nucleophilic 1,6-conjugate addition reaction of para-quinone methides with 3-propenyl-2-silyloxyindoles by a bismuth triflate catalyst has been developed. A number of diphenylmethane type compounds functionalized with oxindole motifs was obtained with excellent yields (up to 99%) and very good diastereoselectivities (up to Z/E > 99:1).
已经开发了三氟甲磺酸铋催化剂对对醌甲基化物与3-丙烯基-2-甲硅烷氧基吲哚的高度非对映选择性的乙烯基亲核性1,6-共轭加成反应。获得了许多具有羟吲哚基序官能化的二苯甲烷类化合物,具有优异的收率(高达99%)和非常好的非对映选择性(高达Z / E > 99:1)。
Vinylogous Nucleophilic Substitution of the Hydroxy Group in Diarylmethanols with 3-Propenyl-2-silyloxyindoles: Towards the Synthesis of <i>α</i>
-Alkylidene-<i>δ</i>
-diaryl-2-oxindoles
作者:Amol P. Jadhav、Amjad Ali、Ravi P. Singh
DOI:10.1002/adsc.201601265
日期:2017.5.2
vinylogous substitution of the hydroxy group of diarylmethyl alcohols with 3‐alkenyl‐2‐silyloxyindoles, which affords broadly substituted α‐alkylidene‐δ‐diaryl‐2‐oxindole products with high efficiency and complete γ‐site and Z‐selectivity. The reaction displays very wide substrate scopes for both the reactants, benzhydryl alcohols and 3‐alkenyl‐2‐silyloxyindoles. The utility of the substituted adducts