stereoselectivity. Aryl tethered homoallylbenzyl ethers such as benzyl ethers of (E)- and (Z)-6-arylhex-3-enyl alcohols undergo a tandem Prins/Friedel–Crafts cyclization in the presence of stoichiometric amounts of DDQ and SnCl4via the benzylic C–H bond activation to furnish the corresponding trans- and cis-fused hexahydro-1H-benzo[f]isochromenes in good yields with complete stereoselectivity.
(In)和(z)-hex-3-en-1,6
-二醇和hept-3-en-1,7
-二醇的1-
苄醚在In( OTF)3通过顺序C-H键活化和分子内的环化的Prins,得到相应的反式-和顺-融合六氢-2- ħ -
呋喃并[3,2- c ^ ]
吡喃和octahydropyrano [4,3- b ]
吡喃分别以良好的产率和优异的立体选择性。芳基束缚的高
烯丙基苄基醚,例如(E)-和(Z)-6- arylhex -3-烯基醇经过串联普林斯/弗里德尔-克拉夫茨环化反应中的
化学计量的量和
DDQ的SnCl存在4经由苄基C-H键活化,以提供相应的反式-和顺式-融合六氢1 H-苯并[ f ]异
色酮的收率高,具有完全的立体选择性。