## Abstract The configurations and conformations of diastereoisomeric 1‐(decahydroquinolin‐8‐yl)butan‐2‐ols and of perhydropyrido[3,2,1‐__j,k__][3,1]benzoxazepines resulting from ring closure of these compounds with formaldehyde have been assigned by ^1^H and ^13^C NMR spectroscopy.
Compounds with bridgehead nitrogen. 48—stereochemistry of the 5-methylperhydropyrido[3,2,1-i,j][3,1]-benzoxazines
✍ Scribed by Trevor A. Crabb; Philip A. Jupp; Christopher H. Turner
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 390 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Six of the eight possible diastereoisomeric 5‐methylperhydropyrido[3,2,1‐i,j][3,1]benzoxazines have been synthesized, and the utility of the C‐3 methylene proton NMR parameters [J(3ax3eq) and Δ3ax3eq] in the assignment of configurations has been demonstrated.
📜 SIMILAR VOLUMES
## Abstract Seven of the possible diastereoisomeric perhydronaphthaleno[3,4‐__e__]pyrido[1,2‐__c__][1,3]oxazines have been synthesized and the configurations and preferred conformations of these assigned on the basis of IR and ^1^H NMR spectroscopy and the application of conformational principles.
## Abstract The ^1^H NMR parameters of the NCH~2~O protons in the spectrum of perhydropyrrolo[1,2‐__c__][1,3]oxazine show its existence in solution at room temperature in the __O__‐inside __cis__‐fused conformation. __rel__‐(3a__S__,6a__S__,6b__R__,10a__S__,11a__S__)‐6a‐Methylperhydroindolo[3,2,1‐_
## Abstract Low‐temperature ^13^C NMR spectroscopy shows perhydropyrido [1,2‐__c__] [1,3]oxazine to adopt a conformational equilibrium in CD~2~Cl~2~–CFCl~3~ solution containing 98% __trans__ fused conformer in equilibrium with 2% __O__‐outside‐__cis__ fused conformer at 203 K. A similar equilibrium
## Abstract The 270 MHz NMR data on __trans__‐ and __cis__‐(H‐4a, H‐7)‐7‐ethylperhydropyrido[1,2‐__c__][1,3]thiazine show heavy conformational bias to the __trans__‐ and __S__‐inside __cis__‐fused conformations, respectively. Comparison of the ^13^C NMR spectra of these anancomeric systems with the