Compounds with bridgehead nitrogen. 57—NMR spectra and stereochemistry of protonated perhydrooxazolo [3,4-a]pyridines, perhydropyrido[1,2-c] [1,3] oxazine and perhydropyrido[1,2-c] [1,3]oxazepine
作者:Trevor A. Crabb、Andrew N. Trethewey
DOI:10.1002/mrc.1260260905
日期:1988.9
perhydrooxazolo[3,4‐a]pyridine, perhydropyrido[1,2‐c][1,3]oxazine and perhydropyrido[1,2‐c][1,3]oxazepine by hydrogen chloride gas in diethyl ether gave mixtures of trans‐ and cis‐fused hydrochlorides containing 28, 75 and 79% of the trans‐fused salts, respectively, which compare with free base equilibria containing 68, 90 and 74% trans‐fused conformers. The cis‐fused salts from perhydrooxazolo[3,4‐a]pyridine existed
用氯化氢气体在乙醚中质子化全氢恶唑并[3,4-a]吡啶、全氢吡啶并[1,2-c][1,3]恶嗪和全氢吡啶并[1,2-c][1,3]恶氮杂,得到混合物反式和顺式稠合盐酸盐分别含有 28%、75% 和 79% 的输血盐,与含有 68%、90 和 74% 的反式稠合构象异构体的游离碱平衡相比。来自全氢恶唑并[3,4-a]吡啶的顺式稠合盐以平衡形式存在于溶液中(CDCl3,298 K),其中顺式内含55%的O,顺式稠合构象异构体外含17%的O。在 D2ODCI 中形成了类似的混合物,但具有较小百分比的顺式稠合盐。