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■ One-Pot Synthesis of Alkoxyamine Derivatives by Reductive Alkoxyamination with a 2-Picoline-Borane Complex

Yasushi Kawase, Takehiro Yamagishi, Tero Kutsuma, Kimio Ueda, Takeo Iwakuma, Tadashi Nakata, and Tsutomu Yokomatsu*

*School of Pharmacy, Tokyo University of Pharmacy & Life Sciences 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan

Abstract

Reduction of oxime ethers with a 2-picoline-borane complex was examined to give alkoxyamine derivatives. The reduction was found to proceed in the presence of aqueous HCl in MeOH-AcOH. The method was extended to one-pot synthesis of alkoxyamine derivatives from aldehydes and ketones. The reaction of carbonyl compounds with alkoxyamines in MeOH-AcOH (10:1), followed by sequential treatment with 2-picoline-borane and 3M HCl afforded alkoxyamine derivatives in good yields. This procedure can be applied to the synthesis of various alkoxyamine derivatives from aliphatic/aromatic aldehydes and ketones.