𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Steric control of chemoselectivity in the reaction of ynamine esters with heterodienes

✍ Scribed by Colin P. Dell

Book ID
104225282
Publisher
Elsevier Science
Year
1992
Tongue
French
Weight
121 KB
Volume
33
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis

Ynnmine esters undergo regioselective formal hetero-Diels-Alder reactions with a$-unsaturated-1,3-dicarbonyl compounds yielding functionalised pyrans. The chemoselectivity of the reaction appears to be governed by sten'c factors.

πŸ“œ SIMILAR VOLUMES

Steric effects ih the reaction of di(bro
Steric effects ih the reaction of di(bromomagnesio)alkanes with carboxylic esters
✍ PersΓ©phone Canonne; Denis BΓ©langer; Gilles Lemay πŸ“‚ Article πŸ“… 1981 πŸ› Elsevier Science 🌐 French βš– 181 KB

Largely different product distributions were observed on the action of various carboxylic esters with 1,4\_di(bromomagnesio)butane and its homologue 1,5\_di(bromomagnesio)pentane. The much larger yields of reduction product with the latter are the evidence for the structural geometric requirements f

Controlled reversal of chemoselectivity
Controlled reversal of chemoselectivity in reactions of allyltitanium ate complexes with carbonyl compounds
✍ M.T. Reetz; B. Wenderoth πŸ“‚ Article πŸ“… 1982 πŸ› Elsevier Science 🌐 French βš– 214 KB

Allyltitanium ate complexes react either aldehyde-or ketone-selectively, depending upon the nature of the ligands at titanium. Although nucleophilic addition of carbanions to carbonyl compounds usually proceeds with high yields', chemoselectivity is frequently low. For example, Grignard or li thium