Diels–Alder reaction of androsta-14,16-dien-17-yl acetates with nitroethylene: Product distribution and selected adduct transformations
摘要:
The Diels-Alder cycloaddition of nitroethylene to some androsta-14,16-dien-17-yl acetates has been studied. The addition occurs stereoselectively, giving predominantly head-to-head-adduct. 14 beta-Cyanomethyl steroids were obtained via the reductive cleavage reaction of bridged nitro compounds. The structures of the new compounds have been fully characterized by 2D NMR and tandem mass-spectrometry methods. (C) 2012 Elsevier Inc. All rights reserved.
Synthesis of 14,16-dien-17-yl acetates of androstane series. NMR and mass spectrometry data
摘要:
On the basis of dehydroepiandrosterone through the Delta(14)- and Delta(15)-androst-17-ones a series of androsta-14,16-dienyl acetates was obtained, the key compounds in the synthesis of 14-substituted steroids. By the methods of two-dimensional NMR spectroscopy the structure of compounds was proved and a full assignment of signals in the H-1 and C-13 NMR spectra was performed. With the use of tandem mass spectrometry the main directions of fragmentation of protonated molecules of the synthesized ketones and dienyl acetates were studied. DOI: 10.1134/S1070363211090234