Synthetic Elaboration of the Side Chain of (<i>R</i>)-2,2-Dimethyl-3-(<i>tert</i>-butoxycarbonyl)-4-ethynyloxazolidine: A New Regio- and Stereoselective Strategy to δ-Functionalized β-Amino Alcohols
An investigation of the reactivity of ethynyloxazolidine 2 is presented. Functionalization at the acetylenic position has been found to occur very easily using the mild Sonogashira conditions. Addition of tributyltin cuprate 1 provided the corresponding stannylated (E)-ethenyloxazolidine 3, a new chiral building block which has been reacted with electrophiles under Pd catalysis. The reaction sequence occurred without racemization and showed an easy and mild procedure for the regio- and stereoselective synthesis of unsaturated amino alcohols.
Synthesis of New Chiral Vinyl Halides from L-Serinal
作者:Eric Branquet、Patrick Meffre、Philippe Durand、François Le Goffic
DOI:10.1080/00397919808005933
日期:1998.2
Abstract The synthesis of new chiral and functionalized vinylhalidesfrom protected L-serinal is described.
摘要 描述了从受保护的 L-丝氨酸合成新的手性和功能化乙烯基卤化物。
Palladium-Catalyzed <i>cross</i>-Benzannulation of Aminoenynes with Diynes. Highly Regioselective Synthesis of Polysubstituted Anilines
Polysubstituted anilines were prepared by the palladium-catalyzed cross-benzannulation of conjugated aminoenynes 1-4 with diynes 8. The reaction proceeded in a highly regioselective manner under mild conditions, and the anilines were obtained as single regioisomers. Our method complements the well-known precedures for the preparation of polysubstituted anilines which are widely used in organic synthesis