The saturated acid 18 was esterified in methanol by the same procedure used for the preparation of the ester 17. The product 19 was obtained in 89% yield as a colorless oil: bp 126-127°; ir (neat) 1750 cm"1 (C=0); nmr (CDC13) 3.68 (s, 3, OCH3).
Considerably lower stereoselective formation of the single inversion product was observed for 5-endo-methyl 2-cyano-3,4-diazapentacyclo [614,0,02~8,07 s11,010~12]dode~-3-ene [endo-(3)] compared to its exo-isomer in their thermal and direct photodecompositions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.