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.
以下是翻译:
在DMF中,吖啶酮与烯丙基膦酸酯/烯丙基氧化膦(OCH2CMe2CH2O)P(O)CH=C=CR1R2,其中R1 = R2 = Me (1),R1 = R2 = [-CH2-]5 (2)}、Ph2P(O)C(H)=C=CR1R2,其中R1 = R2 = Me (3),R1 = R2 = [-CH2-]5 (4)和(EtO)2P(O)C(H)=C=CMe2 (5)在碱催化下发生加成反应,区域专一性地生成膦酸基吖啶酮和吖啶基氧化膦。在钯催化条件下,烯丙烃1和2与9-氯吖啶的反应也得到了吖啶酮加成产物,同时意外得到了α-吖啶基取代的烯丙烃。相比之下,9-苄基-6-氯嘌呤与1反应生成β-取代的嘌呤酮膦酸酯。在没有碱(CsF)存在的情况下,烯丙烃1-2不与吖啶酮反应,但在Pd(OAc)2/DMF(或DMA)/哌伐酸存在下,通过钯-烯丙基配合物重排生成1,3-丁二烯。膦酸基吖啶酮可以进行Horner-Wadsworth-Emmons(HWE)反应,生成N-取代吖啶酮。关键产物已通过单晶X射线衍射进行表征。