Rasta Resin-TBD-Catalyzed γ-Selective Morita–Baylis–Hillman Reactions of α,γ-Disubstituted Allenones
摘要:
Rasta resin-TBD (RR-TBD) was found to be an efficient organocatalyst for -selective Morita-Baylis-Hillman reactions between ,-disubstituted allenones and aryl aldehydes. In these reactions the heterogeneous nature of RR-TBD greatly facilitated product isolation since the catalyst could be separated simply by filtration.
Chloroacetylenes as Michael acceptors. II. Direct ethynylation and vinylation of tertiary enolates.
作者:Andrew S. Kende、Pawel Fludzinski
DOI:10.1016/s0040-4039(00)87345-1
日期:1982.1
The reaction of ClCCCl, PhCCCl and PhSCCCl with a variety of tertiaryenolates leads in 43–90% yields to α-chloroethynyl, α-phenylethynyl and α-thiophenylethynyl derivatives. The −CCCl group is smoothly converted to −CCH using copper powder in HOAc/THF, or is directly reduced (H2/Lindlar catalyst) to the −CHCH2 group, thus providing facile access to many α-ethynyl and α-vinyl ketones and esters