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- We have employed also a more general alternative route to effect the conversion 3a ← 5. The halomagnesium alkoxide derived from the addition of methylmagnesiumiodide to 3a was directly oxidated to 5 in 60% yield by hydrogen-transfer reaction to 1, 1′-(azodicarbonyl)-dipi-peridine. following a known procedure (see ref. 14, 15)
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