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note
-
3Al/(R)-BINOL = 1:1.05), the reaction (5 °C, 45 h) did not complete (61% yield, recovered 1b: 31%) and showed low selectivity (cis/trans = 79:21, cis: 63% ee).
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0345491623
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note
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This may be attributable to the concomitant formation of minor trans-oxazolines by Lewis acid-promoted isomerization of cis-oxazolines through a ring-opening-recyclization pathway involving racemization of the 4-and 5-positions.
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