Two methods for the synthesis of norbornane‐fused indanes via palladium‐catalyzed three‐componentreactions of iodoarenes, norbornenes, and CH2Br2 or α‐diazoesters have been developed. In the reactions, three C−C bonds were constructed and a wide range of norbornane‐fused indanes could be synthesized. The reactions with α‐diazoesters proceeded with a high degree of diastereoselectivity and indanes
Contribution à l'étude des dibenzofluorènes: le dibenzo-2, 3, 5, 6-fluorène
作者:R. H. Martin
DOI:10.1002/hlca.19470300225
日期:1947.3.15
1. La dibenzo-2,3,5,6-fluorénone a été synthétisée par condensation du dialdéhyde phtalique avec la benzo-4,5-hydrindone. La structure de la cétone a été confirmée par dégradation.
A gold-catalyzed cascade cyclization of naphthalene-tethered allenynes gave 4H-cyclopenta[def]phenanthrene (CPP) derivatives. The reaction proceeds through the nucleophilic reaction of an alkyne with the activated allene to generate a vinyl cation intermediate followed by arylation. Selective formation of CPP and dibenzofluorene derivatives using aryl-substituted substrates, depending on the reaction
金催化的萘系联烯炔级联环化得到 4 H -环戊[ def ]菲 (CPP) 衍生物。该反应通过炔烃与活化丙二烯的亲核反应进行,生成乙烯基阳离子中间体,然后进行芳基化。还介绍了根据反应条件,使用芳基取代的底物选择性形成 CPP 和二苯并芴衍生物。