high‐yielding addition reaction (19 examples, 66–99 % yield) with various N‐(trimethylsilyl)methyl‐substituted amines upon irradiation with visiblelight and catalysis by a metal complex. If the alkylidene substituent is non‐symmetric and if the reaction is performed in the presence of a chiral hydrogen‐bonding template, products are obtained with significant enantioselectivity (58–72 % ee) as a mixture
An expedient synthesis of 3-alkylideneoxindoles by Ti(O Pr)4/pyridine-mediated Knoevenagel condensation
作者:Hyun Ju Lee、Jin Woo Lim、Jin Yu、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2013.12.097
日期:2014.2
3-Alkylideneoxindoles have been prepared in excellent yields from oxindole and carbonyl compounds via an in situ generated titanium enolate of oxindole. (Z)-3-Alkylideneoxindoles could be synthesized selectively as major products from unsymmetrical ketones. (C) 2014 Elsevier Ltd. All rights reserved.
Visible-Light-Mediated Intermolecular [2 + 2]-Cycloaddition Reaction of 3-Alkylideneindolin-2-one with Alkenes via Triplet Energy Transfer for the Synthesis of 3-Spirocyclobutyl Oxindoles
作者:Shao-Xian Shi、Huan-Huan Zhang、Yi-Lin Wang、Lin-Hong Jiang、Peng-Fei Xu、Yong-Chun Luo
DOI:10.1021/acs.orglett.3c01695
日期:2023.7.28
[2 + 2]-Cycloaddition is the most straightforward approach to the construction of cyclobutanes. In this paper, the intermolecular [2 + 2]-cycloaddition reaction of 3-alkylideneindolin-2-ones with alkenes was achieved. This reaction can be used in the synthesis of 3-spirocyclobutyl oxindoles, polycyclic oxindoles, and latestagemodification of some drug molecules.