An Expeditious Concise Synthesis of Benzo[b]pyrano[2,3-d]oxepines and Dibenzo[b,d]oxepines
作者:Vishnu Tandon、Vishnu Ram、Hardesh Maurya、Balendu Kumar、Brijesh Kumar
DOI:10.1055/s-0029-1218006
日期:2009.11
An efficient concise synthesis of 4-methylthio-2-oxo-5,6-dihydro-2 H-benzo[ B]pyrano[2,3- D]oxepine-3-carbonitriles has beendelineated through condensation-cyclization of 3,4-dihydro-2 H-benzo[ B]oxepin-5(2 H)-ones and methyl 2-cyano-3,3-dimethylthioacrylatein DMF using powdered KOH as a base. A base--induced reactionof 3,4-dihydro-2 H-benzo[ B]oxepin-5(2 H)-ones and6-aryl-4-methylthio-2 H-pyran-2
4-methylthio-2-oxo-5,6-dihydro-2 H-benzo[B]pyrano[2,3-D]oxepine-3-carbonitriles 的高效简明合成已通过 3,4-二氢-2 H-苯并[B]oxepin-5(2 H)-ones 和甲基 2-氰基-3,3-二甲基硫代丙烯酸酯在 DMF 中使用粉末 KOH 作为碱。3,4-dihydro-2 H-benzo[B]oxepin-5(2H)-ones 和 6-aryl-4-methylthio-2 H-pyran-2-one-3-carbonitrilein 的碱诱导反应在 DMF 中加入粉末状 KOH 得到 (E)- 和 (Z)-2-(4-苯基-5,6-二氢-2H-苯并[B]吡喃并[2,3-D]oxepin-2-的异构混合物ylidene) 乙腈。然而,6-aryl-4-(s EC-amino)-2 H-pyran-2-one-3-carbonitriles