Efficient and Stereoselective Synthesis of Bicyclo[3.2.1]octan-8-ones: Synthesis and Palladium-Catalyzed Isomerization of Functionalized 2-Vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans
作者:Peter Langer、Edith Holtz、Nehad N. R. Saleh
DOI:10.1002/1521-3765(20020215)8:4<917::aid-chem917>3.0.co;2-1
日期:2002.2.15
diastereoselective formation of 2-vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans. The products could be efficiently transformed into functionalized bicyclo[3.2.1]octan-8-ones by a palladium-catalyzed rearrangement reaction. In case of sulfone derivatives, this rearrangement proceeds with high stereospecifity to give exclusively the endo-configured diastereomers. The bicyclo[3.2.1]octane skeleton is present
据报道,用1,4-二溴-2-丁烯将二锂化的环状β-酮酯和β-酮砜进行新的C,O-环二烷基化反应会导致区域选择性和非对映选择性形成2-乙烯基-2,3,3a, 4,5,6-六氢-2,3-苯并呋喃。该产物可以通过钯催化的重排反应有效地转化为官能化的双环[3.2.1] octan-8-one。在砜衍生物的情况下,该重排以高立体特异性进行,以仅给出内构型的非对映异构体。双环[3.2.1]辛烷骨架存在于许多重要的药理天然产物中。