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27144441632
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note
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Only slight decomposition was observed when compound 3 was stored at -18°C for 10 months, while storing at 0°C led to complete decomposition in less than 3 months.
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40
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27144465639
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note
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The best yields achieved in the deprotection step were around 70%, confirming an obvious assumption that γ-alkylidene butenolides are also acid sensitive.
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42
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85018051466
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A similar approach (treatment of carbonyl compounds with amino esters followed by in situ reduction and spontaneous cyclization) has been used by Abdel-Magid and co-workers, see A.F. Abdel-Magid, B.D. Harris, and C.A. Maryanoff Synlett 1994 81 83
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