作者:Lei Yang、Wei Huang、Xiang-Hong He、Ming-Cheng Yang、Xiang Li、Gu He、Cheng Peng、Bo Han
DOI:10.1002/adsc.201600465
日期:2016.9.15
Enantio‐ and diastereoselective inverse‐electron‐demand oxa‐Diels–Alderreactions are described between (Z)‐2‐ylideneoxindoles and aldehydes in the presence of a chiral secondary amine catalyst. The corresponding hydropyrano[3,2‐b]indoles are produced in up to 77% yield with up to 99% ee. Convenient synthetic transformations of the products readily lead to pharmacologically interesting scaffolds bearing
在手性仲胺催化剂的存在下,描述了(Z)-2-亚氧萘并吲哚与醛之间的对映体和非对映体选择性反电子对氧-Diels-Alder反应。相应的氢吡喃并[3,2- b ]吲哚的产率高达77%,ee高达99%。产物的方便的合成转化容易产生带有多个官能团的药理学有趣的支架。该方法也可以为2-螺环3-氧吲哚的不对称合成提供另一种方法。
Synthesis and Reactivity of (3-Oxo-2,3-dihydro-1H-ylidene)acetic Acid Alkyl Esters in Diels-Alder Reactions
Aldolization reactions of 1-acetyl-1H-indol-3(2H)-one with glyoxal derivatives afforded (1-acetyl-3-oxo-2,3-dihydro-1H-indol-2-ylidene)acetic acid ester derivatives 2 and 3. Spiro compounds 6 were obtained by Diels-Alder reactions of 2; inverse electron demand Diels-Alder reactions of 2 afforded pyrano indoles 8.