Efficient and Practical Method for Synthesizing N-Heterocyclic Compounds Using Intramolecular Nucleophilic Acyl Substitution Reactions Mediated by Ti(O-i-Pr)4/2i-PrMgX Reagent. Synthesis of Quinolones, Pyrroles, Indoles, and Optically Active N-Heterocycles Including Allopumiliotoxin Alkaloid 267A

Abstract

Treatment of N-(2- or 3-alkynyl)amino esters with a low-valent titanium reagent diisopropoxy(η2-propene)titanium (1), generated in situ by the reaction of Ti(O-i-Pr)4 and 2i-PrMgCl, resulted in an ...