Brönsted Acid-Catalyzed One-Pot Synthesis of Indoles from <i>o</i>-Aminobenzyl Alcohols and Furans
作者:Alexey Kuznetsov、Anton Makarov、Aleksandr E. Rubtsov、Alexander V. Butin、Vladimir Gevorgyan
DOI:10.1021/jo402132p
日期:2013.12.6
Brönstedacid-catalyzed one-pot synthesis of indoles from o-aminobenzyl alcohols and furans has been developed. This method operates via the in situ formation of aminobenzylfuran, followed by its recyclization into the indole core. The method proved to be efficient for substrates possessing different functional groups, including −OMe, −CO2Cy, and −Br. The resulting indoles can easily be transformed
A simple and practical synthesis of ynones directly from readily available aldehydes was developed for the first time under mild reaction conditions via a Rh(III)- or Ir(III)-catalyzed formyl C-H bondactivation.
Highly Diastereo- and Enantioselective Synthesis of Tetrahydro-5<i>H</i>
-Indolo[2,3-<i>b</i>
]quinolines through Copper-Catalyzed Propargylic Dearomatization of Indoles
作者:Wen Shao、Shu-Li You
DOI:10.1002/chem.201703443
日期:2017.9.12
The first copper‐catalyzed intermolecular asymmetric propargylic dearomatization/annulation cascade sequence of indoles via a copper‐allenylidene amphiphilic intermediate has been achieved. This protocol provides a direct asymmetric synthetic method for the preparation of tetrahydro‐5H‐indolo[2,3‐b]quinolines, the core structure of indole alkaloids communesins A–H and perophoramidine. This method features
通过铜-亚烯基两亲中间体,获得了第一个铜催化的吲哚分子间不对称炔丙基脱芳香/环化级联序列。该方案为制备四氢-5 H-吲哚并[2,3- b ]喹啉提供了一种直接的不对称合成方法,该吲哚是吲哚生物碱Communesins A–H和过邻苯二甲idine啶的核心结构。该方法具有出众的收率,高非对映选择性(高达> 19:1 dr)和对映选择性(高达94% ee),温和的条件和广泛的底物范围。
Catalytic Asymmetric [4 + 1] Annulation of Sulfur Ylides with Copper–Allenylidene Intermediates
1] cycloaddition of propargylic carbamates and sulfur ylides was successfully developed. This strategy led to a series of chiral indolines with synthetically flexible alkyne groups in good yields and with high enantio- and diastereoselectivities (up to 99% yield, 98% ee, and >95:5 dr). A possible mechanism and stereoinduction mode with copper-allenylidenes were proposed as the possible dipolar intermediate
Synthesis of 1,2-Dihydroquinolines via Hydrazine-Catalyzed Ring-Closing Carbonyl-Olefin Metathesis
作者:Yunfei Zhang、Jae Hun Sim、Samantha N. MacMillan、Tristan H. Lambert
DOI:10.1021/acs.orglett.0c02116
日期:2020.8.7
The synthesis of 1,2-dihydroquinolines by the hydrazine-catalyzed ring-closing carbonyl-olefin metathesis (RCCOM) of N-prenylated 2-aminobenzaldehydes is reported. Substrates with a variety of substitution patterns are shown. With an acid-labile protecting group on the nitrogen atom, in situ deprotection and autoxidation furnish quinoline. In comparison with related oxygen-containing substrates, the