111008-09-4Relevant articles and documents
Regioselectivity in the 1,3-Dipolar Cycloaddition Reaction of Pyridinium Dicyanomethylides with Unsymmetric Alkynes
Matsumoto, Kiyoshi,Uchida, Takane,Konishi, Hideyuki,Watanabe, Youko,Aoyama, Kinuyo,Asahi, Momoyo
, p. 807 - 808 (2007/10/02)
Representative pyridinium dicyanomethylides underwent regioselectively 1,3-dipolar cycloaddition onto methyl 3-trimethylsilyl-2-propynate and methyl 3-phenyl-2-propynate yielding the corresponding indolizines whereby 1-methoxycarbonylindolizines forms either exclusively or predominantly, in agreement with HOMO(ylide)-LUMO(dipolarophile) interaction as revealed by CNDO/2 calculation.