Direct Catalytic Asymmetric Conjugate Addition of Terminal Alkynes to α,β-Unsaturated Thioamides
作者:Ryo Yazaki、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1021/ja105141x
日期:2010.8.4
Directcatalyticasymmetric conjugate addition of terminal alkynes to alpha,beta-unsaturated thioamides under proton transfer conditions is described. Soft Lewis acid/hard Brønsted base cooperative catalysis is crucial for simultaneous activation of terminal alkynes and thioamides, affording the beta-alkynylthioamides in a highly enantioselective manner. Control experiments suggested that the intermediate
Regiocontrolled 1,2-, 1,4-, and 1,6-additions of organometallics to unsaturated thioamides
作者:Y. Tamaru、T. Harada、S. Nishi、Z. Yoshida
DOI:10.1016/s0040-4039(00)87348-7
日期:——
1,4-Addition of allyllithiums to α,β-unsaturated thioamides and 1,4-(kinetic) and 1,6-(thermodynamic)regiocontrolled additions of lithium enolates to thiosorbamide are reported.
Unusual stereoselectivity in the synthesis of 4-oxa-δ-valerothiolactones: structure proof of β-hydroxythioamide
作者:Yoshinao Tamaru、Masuhiro Okada、Osamu Kitao、Zen-Ichi Yoshida
DOI:10.1016/s0040-4039(01)81689-0
日期:1984.1
Stereoselectivity in the formation of 4-oxa-δ-valerothiolactone 2 from β-hydroxythioamide 1 is discussed. The structure of 1 is deduced from the structure of 2.
Threo selective cross aldol condensation with thioamide enolates generated by a michael addition of organometallics to unsaturated thioamides
作者:Y. Tamaru、T. Hioki、Z. Yoshida
DOI:10.1016/s0040-4039(01)81688-9
日期:——
Crotonothioamide, sorbothioamide, and cinnamothioamide undergo a threo selective aldol condensation via their enolates generated by a Michael addition of organometallics.