Imino Diels–Alder reaction of boronates. Preparation and characterization of new 3,4-dihydroquinoline and 1,2,3,6-tetrahydropyridine derivatives

Syntheses and characterization of a new class of mono‐ and heterodinuclear derivatives of boron derived from Schiff bases

“…[31] The 1 H, 13 C (300 MHz), 11 B (96.3 MHz) and 29 Si (59.6 MHz) NMR spectra in CDCl 3 solution were recorded with a Jeol FT Al 300 spectrometer. 1 H and 13 C NMR spectra were recorded using TMS as internal refrence and 11 B NMR and 29 Si NMR were recorded using B(OMe) 3 and Me 3 SiCl as external references, respectively. IR spectra were recorded on an 8400s Shimadzu FT-IR spectrophotometer as nujul mull on a KBr cell in the range 4000-400 cm −1 .…”

Synthesis of Bicyclic Boron Heterocycles Containing [1,3,4,2]Oxadiazaborole and [1,3,2]Oxazaborine

“…30 Structures such as 10 are similarly derived from imines of o-hydroxyanilines (Figure 4). 31 Phenylboronic acid reacts with N-alkyl-N-(2-hydroxyethyl)-2aminoacetic acids to generate the bicycles 11 (Figure 4). 32 It is significant for our future biological investigations of our new boron heterocycles that compounds 9 were shown to be inhibitors of the enzyme human neutrophile elastase.…”

{2-Hydroxy-6-[(2-oxidophenyl)iminomethyl-κ2N,O]phenolato-κO1}phenylboron

“…Grignard reagents to azomethine carbon atoms (Rodríguez et al, 2005a(Rodríguez et al, , 2005bLópez-Ruiz et al, 2008).…”