Palladium-Catalyzed Annulation of Allenes with Indole-2-carboxylic Acid Derivatives: Synthesis of Indolo[2,3-<i>c</i>]pyrane-1-ones via Ar–I Reactivity or C–H Functionalization
作者:R. Rama Suresh、K. C. Kumara Swamy
DOI:10.1021/jo301149s
日期:2012.8.17
indolo[2,3-c]pyrane-1-one derivatives through the Pd-catalyzed regioselective annulation of allenes with 3-iodo-1-alkylindole-2-carboxylic acids is described. This method is fairly general for a wide range of allenes affording the respective indolo[2,3-c]pyrane-1-ones in good to excellent yields. In addition, a Pd(II)-catalyzed oxidative coupling of indole-2-caboxylic acidderivatives with allenes via direct
提出了两种方法,一种涉及Ar–I反应性,另一种通过CH–H官能化,用于通过相应的烯键形成吲哚[2,3 - c ]吡喃-1-酮。描述了通过Pd催化的烯丙基与3-碘-1-烷基吲哚-2-羧酸的区域选择性环化制备吲哚并[2,3 - c ]吡喃-1-酮衍生物的高效方法。该方法对于广泛范围的丙二烯是相当普遍的,它们以良好或优异的产率提供了各自的吲哚并[2,3 - c ]吡喃-1-酮。此外,Pd(II)催化吲哚-2-羧酸衍生物与丙二烯的氧化偶合,可通过直接的C–H功能化得到相应的吲哚[2,3- c]。已经开发了中等至良好产率的]吡喃-1-酮。
P(<i>n</i>-Bu)<sub>3</sub>Catalyzed Reactions of Salicyl<i>N</i>-Thiophosphinyl Imines with Allenylphosphonates: Synthesis of Phosphono-Chromans
作者:R. Rama Suresh、R. N. Prasad Tulichala、Ramesh Kotikalapudi、K. C. Kumara Swamy
DOI:10.1002/jhet.2071
日期:2014.5
A phosphine [P(n‐Bu)3]‐catalyzed reaction for the synthesis of phosphono‐chromans from allenylphosphonates and salicyl N‐thiophosphinyl imines has been described and compared with reactions for phosphorus‐free allenes. The products are (β,γ)‐cyclized and are obtained in good yields (57–83%). A key product is characterized by X‐ray crystallography.
phosphonates/phosphine oxides or a sulfone. This reaction involves C–S bond formation and not C–O bond formation, and thus is different from similar reactions of allenes with PhCH=NTs in the presence of bases like DMAP, DBU or Ph3P/(alkyl)3P wherein cycloaddition products are generally observed. The reactions of phosphorylated allenes with DBU lead to the unprecedented formation of products in which the DBU ring
Reaction of allenylphosphonates/allenylphosphine oxides with thiocyanates/isothiocyanates or oxalyl chloride/AgNO<sub>3</sub>
作者:K. C. Kumara Swamy、Manab Chakravarty、Shubham Debnath、M. Nagarjuna Reddy
DOI:10.1080/10426507.2017.1287707
日期:2017.6.3
GRAPHICAL ABSTRACT ABSTRACT In this paper, we describe thiocyanation as well as chlorination of selected allenylphosphonates/allenyl phosphine oxide, using ammonium thiocaynate or (OCH2CMe2CH2O)PNCS (for thiocyanation) or oxalyl chloride/AgNO3 for chlorination. The resulting products are vinyl (thiocyanato)phosphonates or vicinal dichloro(vinyl) phosphonates. One of the vinyl thiocyanato-phosphonates
图形摘要 在本文中,我们描述了硫氰化以及选定的烯丙基膦酸酯/烯丙基氧化膦的氯化,使用硫氰酸铵或 (OCH2CMe2CH2O)PNCS(用于硫氰化)或草酰氯/AgNO3 用于氯化。所得产物是乙烯基(硫氰酸根合)膦酸酯或邻位二氯(乙烯基)膦酸酯。一种乙烯基硫氰酸根合膦酸酯的特征在于单晶 X 射线晶体学。
Stereoselective Synthesis of Pyrrolo[1,2-a]indoles from Allenes in PEG-400 as the Reaction Medium
作者:K. Kumara Swamy、M. Phani Pavan
DOI:10.1055/s-0030-1260533
日期:2011.6
Base-catalyzed domino cyclization of allenes with 3-chloro-2-formylindoles in PEG-400 was investigated. Pyrroloindoles were formed stereoselectively as single products. The structure of the product depends on the type of allene used. Two compounds have been characterized by single crystal X-ray diffraction.
研究了 PEG-400 中丙二烯与 3-氯-2-甲酰基吲哚的碱催化多米诺环化。吡咯并吲哚立体选择性地形成为单一产物。产品的结构取决于所用丙二烯的类型。两种化合物已通过单晶 X 射线衍射进行了表征。