Triphenylphosphine → HCID 86601371, compound

Participants

Reaction Steps

To a stirring mixture at room temperature of (S)-2-hydroxymethyl-morpholine-4-carboxylic acid, tert-butyl ester, 2-ethoxyphenol and triphenylphosphine in DME was added dropwise diisopropyl azodicarboxylate. The solution was stirred at room temperature for 24 h, concentrated (to remove most of the DME), then suspended into hexanes. The solid that formed was filtered. The filtrate was concentrated, redissolved into diethyl ether, then washed with 1 N NaOH (2×), sat. KH2PO4 and brine solutions. The organic extract was dried (MgSO4), filtered, concentrated and chromatographed (MPLC, silica gel, 20% EtOAc in hexanes) to give (S)-2-(2-ethoxy-phenoxymethyl)-morpholine-4-carboxylic acid, tert-butyl ester as a colorless oil.

Provenance & Evidence