Dienamine-Mediated Inverse-Electron-Demand Hetero-Diels-Alder Reaction by Using an Enantioselective H-Bond-Directing Strategy
摘要:
Giving directions: optically active dihydropyrans bearing three contiguous stereogenic centers can be efficiently prepared by the title reaction. High stereo- and regiocontrol can be achieved by employing a bifunctional H-bond-directing aminocatalyst.
A new approach to the synthesis of higher 3-deoxyglyculosonic acids
作者:N.K. Kochetkov、B.A. Dmitriev、L.V. Backinowsky
DOI:10.1016/s0008-6215(00)81111-8
日期:1967.12
Abstract A novel approach to the synthesis of 3-deoxyglyculosonic acids is reported. The key step in this synthesis involves the transformation of a monosaccharide by the Wittig reaction into a 3,4-dideoxyglyculos-3-enonic acid, and subsequent lactonisation.
Concise synthesis of cycloheptatrienes from aldehydes and the Wittig reagent prepared from pyruvic ester
作者:Tomoyuki Yoshimura、Kanta Chino、Jun-ichi Matsuo
DOI:10.1016/j.tetlet.2021.153150
日期:2021.6
and concise synthesis of 1,3,5-cycloheptatrienes has been developed. The reaction of 4-substituted-4-pentenal derivatives with the Wittig reagent prepared from pyruvic ester under the optimal conditions proceeded to give 1,6-di- and 1,6,7-trisubstituted-1,3,5-cycloheptatrienes in moderate yield. The synthesis is advantageous through its use of readily available reagents, milder reaction conditions compared