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。
Cycloaddition Reactions of Allenylphosphonates and Related Allenes with Dialkyl Acetylenedicarboxylates, 1,3-Diphenylisobenzofuran, and Anthracene
作者:K. V. Sajna、Ramesh Kotikalapudi、Manab Chakravarty、N. N. Bhuvan Kumar、K. C. Kumara Swamy
DOI:10.1021/jo102240u
日期:2011.2.4
opening of the [β,γ] carbon−carbon double bond of the allene is realized. In contrast to these, the reaction of allenylphosphonate (OCH2CMe2CH2O)P(O)(H)C═C═CMe2 possessing a terminal ═CMe2 group with DMAD occurs by both [2 + 2] cycloaddition and ene reaction. While the reaction of ═CH2 terminal allenylphosphonates as well as allenylphosphine oxides with 1,3-diphenylisobenzofuran afforded preferentially
Reactivity of allenylphosphonates and allenylphosphine oxides toward 9-chloroacridines and acridone– A facile route to new N-substituted acridones
作者:A LEELA SIVA KUMARI、VENU SRINIVAS、K C KUMARA SWAMY
DOI:10.1007/s12039-013-0498-3
日期:2013.11
Base-mediated addition of acridones to allenylphosphonates/allenylphosphine oxides (OCH2CMe2CH2O)P(O)CH=C=CR1R2 R1 = R2 = Me (1), R1 = R2 = [ $-\rm CH}_2^-}$ ]5 (2)}, Ph2P(O)C(H)= C=CR1R2 R1 = R2 = Me (3), R1 = R2 = [ $-\rm CH}_2^-}$ ]5 (4)} and (EtO)2P(O)C(H)=C=CMe2 (5) in DMF results in the regiospecific formation of phosphono-acridones and acridonylphosphine oxides. The acridone addition products were also obtained in the reaction of allenes 1 and 2 with 9-chloroacridine under [Pd]-catalysed conditions, along with (unexpected) α-acridinyl substituted allenes. In contrast, 9-benzyl-6-chloro-purine reacted with 1 affording a β-substituted purinone phosphonate. Allenes 1–2 did not react with acridones in the absence of base (CsF), but in the presence of Pd(OAc)2/DMF (or DMA)/pivalic acid rearranged to give 1,3-butadienes probably via [Pd]-allyl complexes. The phosphono-acridones were amenable to Horner–Wadsworth–Emmons (HWE) reaction and led to N-substituted acridones. Key products have been characterized by single-crystal X-ray crystallography.