ChemInform Abstract: Ring Transformations of Heterocyclic Compounds. Part 19. Spiro[dihydropyridine-indolines] Novel Heterocycles with Two Spiro-Condensed N-Containing Subunits Easy Accessible by 1,3-Oxazinium Ring Transformation.

Ring transformations of heterocyclic com

Ring transformations of heterocyclic compounds. XIX. Spiro[dihydropyridine-indolines] novel heterocycles with two spiro-condensed N-containing subunits easy accessible by 1,3-oxazinium ring transformation

✍ Thomas Zimmermann; Ulrich Abram 📂 Article 📅 2000 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 340 KB

## Abstract The synthesis of hitherto unknown 1‐benzoyl‐1′,3′,3′‐trimethyl‐4,6‐diphenylspiro[1,2‐dihydropyridine‐2,2′‐indolines] **5** from 2,4,6‐triphenyl‐1,3‐oxazinium tetrafluoroborate (**1b**) and 1,3,3‐trimethyl‐2‐methyleneindolines **2** (used as such or generated __in situ__ from the corresp