The reaction of various cyclic and acyclic alkynes with lithium dust (2% sodium) to form vicinal dilithioalkenes has been investigated: Aliphatic alkynes, e.g. 3-hexyne (27a), exclusively afford the corresponding (E)-dilithioalkenes, insoluble solids which are stable at room temperature and allow access to a variety of tetrasubstituted olefins in acceptable yields
First Examples of Episulfone Substitution Reactions via .alpha.-Sulfonyl Carbanion Intermediates
作者:Adriano B. Muccioli、Nigel S. Simpkins、Andrew Mortlock
DOI:10.1021/jo00097a012
日期:1994.9
Three-membered cyclic sulfones (episulfones) undergo substitution on treatment with base-electrophile mixtures, such as LDA-Me(3)SiCl and tBu-P4-phosphazene base-PhCHO, to give either substituted episulfones or the corresponding alkenes following loss of SO2.
Muccioli Adriano B., Simpkins Nigel S., Mortlock Andrew, J. Org. Chem, 59 (1994) N 18, S 5141-5143
作者:Muccioli Adriano B., Simpkins Nigel S., Mortlock Andrew
DOI:——
日期:——
Maercker Adalbert, Girreser Ulrich, Tetrahedron, 50 (1994) N 27, S 8019-8034