Preparation and reactions of zinc and copper organometallics bearing acidic hydrogens
摘要:
Organozinc and copper reagents bearing unprotected primary or secondary amines or amides or a terminal acetylenic proton were prepared and reacted with various electrophiles in good yields.
The four isomeric 5, 10-pentadecadienals 1, 2, 3 and 4 were prepared by stereo-selective routes from acetylenic precursors. Two of them, 2 and 4, were also made by Wittig reaction from 2-hydroxytetrahydropyran (29). 2-Hydroxytetrahydropyran (29) yields (Z)-5-alkenols efficiently by Wittig reaction, and (Z)-4-hexenol was similarly made from 2-hydroxytetrahydrofuran (66).