Tandem Cyclization of Enynes Containing a Thioether or Ether Linkage via Ruthenium Allenylidene and Vinylidene Complexes
作者:Yi-Jhen Feng、Ji-Xian Lo、Ying-Chih Lin、Shou-Ling Huang、Yu Wang、Yi-Hung Liu
DOI:10.1021/om400742x
日期:2013.11.11
of 1a,c, the presence of the methyl group promotes cyclization reactions and their tandem cyclizations are further induced by MeOH. The reaction of 1a in CH2Cl2 gives the three products 2a–4a. Complex 2a, with a seven-membered thio ring bonded at Cβ of the vinylidene ligand, is formed via a C–C bond formation between two unsaturated groups in moderate yield. Complex 3a is formed via migration of PPh3
两个芳S-烯炔HC≡CCH(OH)(C 6 H ^ 4)SCH 2 C(R)= CH 2(1A,R =甲基; 1b中,R = H)含有烯属基团具有和不具有内部甲基取代基和O形烯炔HC≡CCH(OH)CME 2 CH 2 OCH 2 C(Me)的= CH 2(1C)还与对烯烃基团,但没有芳香族基团的内部甲基取代基已被制备。在[Ru] Cl诱导的([Ru] = Cp(PPh)3 Ru)反应中1a,c,甲基的存在促进了环化反应,并且它们的串联环化被MeOH进一步诱导。1a在CH 2 Cl 2中的反应给出了三种产物2a – 4a。复杂2a中,具有7元在C键合的硫代环β亚乙烯基配体,经由在适中的产率两个不饱和基团之间的C-C键的形成而形成。络合物3a是通过PPh 3从金属迁移到炔基的末端碳上并随后配位S原子而形成的。卡宾络合物4a通过在炔基的内部碳上加成S并伴随着烯丙基从硫到新形成的噻吩环的迁移,形成S