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15
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85038541141
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note
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8. The regiochemistry of the products were confirmed by variable temperature 2D NMR studies.
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16
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0010373666
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9. Verenikina, G.; Chauser, E. G.; Yurkevich, A. M. Zh. Obshch. Khim. 1971, 41, 1630-1632.
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Verenikina, G.1
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17
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85038545041
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note
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10. For maximum reliability on small scale, a high osmium catalyst concentration (10 %) is recommended in these reactions. In most cases however, it was possible to reduce the catalyst content to 3 % without significant yield loss. (for compound 14: 76 % yield with 10 % catalyst, 74 % with 5 %, and 72 % with 3 %). It is also usually possible to reduce the excess of the chloramine salt of the adenine-derivative to two equivalents. At room temperature, for some substrates relatively long reaction times were required so that the reactions are best performed at 40 - 50 °C.
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